Class B driver
First Claim
Patent Images
1. A communication circuit comprising:
- a digital-to-analog converter to receive a digital control signal, and to provide an analog control signal, the digital-to-analog converter comprising N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements, wherein M is equal to N−
1, wherein an output of the mth one of the M delay elements controls the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the digital control signal, and wherein the analog control signal comprises the sum of the outputs of the N current sources; and
a voltage-to-current converter to provide a transmit signal based on the analog control signal.
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Abstract
A communication circuit, Ethernet controller card, and method comprises K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding analog control signal, wherein K is at least two; K voltage-to-current converters each providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and wherein the corresponding bi-level transmit signal components of each of the K voltage-to-current converters are combined to produce a J-level transmit signal, wherein J=K+1.
308 Citations
156 Claims
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1. A communication circuit comprising:
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a digital-to-analog converter to receive a digital control signal, and to provide an analog control signal, the digital-to-analog converter comprising N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements,wherein M is equal to N−
1,wherein an output of the mth one of the M delay elements controls the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the digital control signal, and wherein the analog control signal comprises the sum of the outputs of the N current sources; and
a voltage-to-current converter to provide a transmit signal based on the analog control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communication circuit, comprising:
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a digital-to-analog converter to receive a digital control signal, and to provide an analog control signal, the digital-to-analog converter comprising;
N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements, wherein M is equal to N−
1, wherein an output of the mth one of the M delay elements is arranged in communication with the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the digital control signal, andwherein the analog control signal comprises the a sum of the outputs of the N current sources;
a voltage-to-current converter to provide a transmit signal based on the analog control signal, wherein the voltage-to-current-converter provides a replica of the transmit signal;
a first sub-circuit having a composite input to receive a differential composite signal comprising the transmit signal, a replica input to receive a differential replica signal comprising the replica of the transmit signal, and a difference output to provide a differential difference signal representing a difference between the differential composite signal and the differential replica signal;
a second sub-circuit which produces first and second single-ended replica signals which together substantially comprise the differential replica signal; and
a third sub-circuit, which is coupled to the first and second sub-circuits, and which produces the differential replica signal from the first and second single-ended replica signals.
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10. A communication circuit comprising:
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K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding analog control signal, wherein K is at least two;
K voltage-to-current converters each providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and
wherein the corresponding bi-level transmit signal component of each of the K voltage-to-current converters are combined to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A communication circuit, comprising:
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K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding analog control signal, wherein K is at least two;
K voltage-to-current converters each providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals;
wherein the corresponding bi-level transmit signal component of each of the K voltage-to-current converters are combined to produce a J-level transmit signal, wherein J=K+1, wherein the K voltage-to-current converters provide a replica of the J-level transmit signal, wherein the replica of the transmit signal comprises first and second single-ended replica signals;
a first sub-circuit which produces a differential replica signal from the first and second single-ended replica signals; and
a second sub-circuit coupled to the first sub-circuit and the voltage-to-current converters and having a composite input to receive a differential composite signal comprising the transmit signal, a replica input to receive the differential replica signal, and a difference output to provide a differential difference signal representing a difference between the differential composite signal and the differential replica signal.
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18. A communication circuit comprising:
K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding transmit signal component, wherein K is at least two, and wherein each of the K digital-to-analog converters comprises N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements, wherein M is equal to N−
1, wherein an output of the mth one of the M delay elements controls the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the corresponding digital control signal, andwherein the corresponding transmit signal component comprises the a sum of the outputs of the N current sources; and
wherein the corresponding transmit signal component of each of the K digital-to-analog converters are combined to produce a J-level transmit signal, wherein J=K +1. - View Dependent Claims (19, 20, 21)
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22. A communication circuit, comprising:
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K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding transmit signal component, wherein K is at least two, and wherein each of the K digital-to-analog converters comprises;
N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements, wherein M is equal to N−
1, wherein an output of the mth one of the M delay elements is arranged in communication with the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the corresponding digital control signal, andwherein the corresponding transmit signal component comprises the a sum of the outputs of the N current sources; and
wherein the corresponding transmit signal component of each of the K digital-to-analog converters are combined to produce a J-level transmit signal, wherein J=K+1; and
L digital-to-analog converters each receiving the corresponding digital control signal and each providing a corresponding replica transmit signal component, wherein L=K; and
wherein the corresponding replica transmit signal component of each of the L digital-to-analog converters are combined to produce a J-level replica transmit signal.
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23. An Ethernet controller comprising:
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a digital-to-analog converter to receive a digital control signal, and to provide an analog control signal, the digital-to-analog converter comprising N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements,wherein M is equal to N−
1,wherein an output of the mth one of the M delay elements controls the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the digital control signal, and wherein the analog control signal comprises the sum of the outputs of the N current sources; and
a voltage-to-current converter to provide a transmit signal based on the analog control signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. An Ethernet controller, comprising:
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a digital-to-analog converter to receive a digital control signal, and to provide an analog control signal, the digital-to-analog converter comprising;
N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements, wherein M is equal to N−
1, wherein an output of the mth one of the M delay elements is arranged in communication with the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the digital control signal, andwherein the analog control signal comprises the a sum of the outputs of the N current sources;
a voltage-to-current converter to provide a transmit signal based on the analog control signal, wherein the voltage-to-current converter provides a replica of the transmit signal;
a first sub-circuit having a composite input to receive a differential composite signal comprising the transmit signal, a replica input to receive a differential replica signal comprising the replica of the transmit signal, and a difference output to provide a differential difference signal representing a difference between the differential composite signal and the differential replica signal;
a second sub-circuit which produces first and second single-ended replica signals which together substantially comprise the differential replica signal; and
a third sub-circuit, which is coupled to the first and second sub-circuits, and which produces the differential replica signal from the first and second single-ended replica signals.
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32. An Ethernet controller comprising:
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K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding analog control signal, wherein K is at least two;
K voltage-to-current converters each providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and
wherein the corresponding bi-level transmit signal component of each of the K voltage-to-current converters are combined to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. An Ethernet controller, comprising:
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K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding analog control signal, wherein K is at least two;
K voltage-to-current converters each providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and
wherein the corresponding bi-level transmit signal component of each of the K voltage-to-current converters are combined to produce a J-level transmit signal, wherein J=K+1, wherein the K voltage-to-current converters provide a replica of the J-level transmit signal, wherein the replica of the transmit signal comprises first and second single-ended replica signals;
a first sub-circuit which produces a differential replica signal from the first and second single-ended replica signals; and
a second sub-circuit coupled to the first sub-circuit and the voltage-to-current converters and having a composite input to receive a differential composite signal comprising the transmit signal, a replica input to receive the differential replica signal, and a difference output to provide a differential difference signal representing a difference between the differential composite signal and the differential replica signal.
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40. An Ethernet controller comprising:
K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding transmit signal component, wherein K is at least two, and wherein each of the K digital-to-analog converters comprises N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements, wherein M is equal to N−
1, wherein an output of the mth one of the M delay elements controls the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the corresponding digital control signal, andwherein the corresponding transmit signal component comprises the a sum of the outputs of the N current sources; and
wherein the corresponding transmit signal component of each of the K digital-to-analog converters are combined to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (41, 42, 43)
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44. An Ethernet controller, comprising:
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K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding transmit signal component, wherein K is at least two, and wherein each of the K digital-to-analog converters comprises;
N current sources configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current sources includes a respective control input, M delay elements, an mth one of the M delay elements including an input in communication with an m−
1th one of the M delay elements, wherein M is equal to N−
1, wherein an output of the mth one of the M delay elements is arranged in communication with the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the corresponding digital control signal, andwherein the corresponding transmit signal component comprises the a sum of the outputs of the N current sources; and
wherein the corresponding transmit signal component of each of the K digital-to-analog converters are combined to produce a J-level transmit signal, wherein J=K+1; and
L digital-to-analog converters each receiving the corresponding digital control signal and each providing a corresponding replica transmit signal component, wherein L=K; and
wherein the corresponding replica signal component of each of the L digital-to-analog converters are combined to produce a J-level replica transmit signal.
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45. A communication circuit comprising:
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digital-to-analog converter means for receiving a digital control signal, and for providing an analog control signal, the digital-to-analog converter means comprising N current source means for providing current configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current source means includes a respective means for inputting; and
M delay means for delaying, an mth one of the M delaying means including means for inputting in communication with an m−
1th one of the M delay means,wherein M is equal to N−
1, andwherein means for outputting of the mth one of the M delay means controls the inputting means of an m+1th one of the N current source means, and wherein the analog control signal comprises the sum of the outputs of the N current source means; and
voltage-to-current converter means for providing a transmit signal based on the analog control signal. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52)
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53. A communication circuit, comprising:
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digital-to-analog converter means for receiving a digital control signal, and for providing an analog control signal, the digital-to-analog converter means comprising;
N current source means for providing current configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current source means includes a respective means for inputting; and
M delay means for delaying, an mth one of the M delaying delay means including means for inputting in communication with an m−
1th one of the M delay means, wherein M is equal to N−
1, and wherein means for outputting of the mth one of the M delay means is arranged in communication with the inputting means for inputting of an m+1th one of the N current source means, andwherein the analog control signal comprises the a sum of the outputs of the N current source means;
voltage-to-current converter means for providing a transmit signal based on the analog control signal, wherein the voltage-to-current converter means provides a replica of the transmit signal;
summing means for receiving a differential composite signal comprising the transmit signal, receiving a differential replica signal comprising the replica of the transmit signal, and providing a differential difference signal representing a difference between the differential composite signal and the differential replica signal;
replicating means for producing first and second single-ended replica signals which together substantially comprise the differential replica signal; and
converting means, which is coupled to the summing means and replicating means, for producing the differential replica signal from the first and second single-ended replica signals.
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54. A communication circuit comprising:
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K digital-to-analog converter means each for receiving a corresponding digital control signal and each for providing a corresponding analog control signal, wherein K is at least two;
K voltage-to-current converter means each for providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and
wherein the corresponding bi-level transmit signal components of each of the K voltage-to-current converter means are combined to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (55, 56, 57, 58, 59, 60)
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61. A communication circuit, comprising:
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K digital-to-analog converter means each for receiving a corresponding digital control signal and each for providing a corresponding analog control signal, wherein K is at least two;
K voltage-to-current converter means each for providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals, wherein the corresponding bi-level transmit signal components of each of the K voltage-to-current converter means are combined to produce a J-level transmit signal, wherein J=K+1, wherein the K voltage-to-current converter means provide a replica of the J-level transmit signal, wherein the replica of the transmit signal comprises first and second single-ended replica signals;
converter means for producing a differential replica signal from the first and second single-ended replica signals; and
summing means, coupled to the converter means and the voltage-to-current converter means, for receiving a differential composite signal comprising the transmit signal, receiving the differential replica signal, and providing a differential difference signal representing a difference between the differential composite signal and the differential replica signal.
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62. A communication circuit comprising:
K digital-to-analog converter means each for receiving a corresponding digital control signal and each for providing a corresponding transmit signal component, wherein K is at least two, and wherein at least one each of the K digital-to-analog converter means comprises N current source means for providing current configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current source means includes a respective means for inputting; and
M delay means for delaying, an mth one of the M delaying delay means including means for inputting in communication with an m−
1th one of the M delay means, wherein M is equal to N−
1, and wherein means for outputting of the mth one of the M delay means controls the inputting means for inputting of an m+1th one of the N current source means, andwherein the corresponding transmit signal component comprises the a sum of the outputs of the N current sources; and
wherein the corresponding transmit signal components of each of the K digital-to-analog converter means are combined to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (63, 64, 65)
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66. A communication circuit, comprising:
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K digital-to-analog converter means each for receiving a corresponding digital control signal and each for providing a corresponding transmit signal component, wherein K is at least two, and wherein at least one each of the K digital-to-analog converter means comprises;
N current source means for providing current configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current source means includes a respective means for inputting, and M delay means for delaying, an mth one of the M delaying delay means including means for inputting in communication with an m−
1th one of the M delay means,wherein M is equal to N−
1, andwherein means for outputting of the mth one of the M delay means is arranged in communication with the inputting means for inputting of an m+1th one of the N current source means, wherein the corresponding transmit signal component comprises the a sum of the outputs of the N current sources, and wherein the corresponding transmit signal components of each of the K digital-to-analog converter means are combined to produce a J-level transmit signal wherein J=K+1; and
L digital-to-analog converter means each for receiving the corresponding digital control signal and each for providing a corresponding replica transmit signal component, wherein L=K, and wherein the corresponding replica transmit signal components of each of the L digital-to-analog converters are combined to produce a J-level replica transmit signal.
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67. An Ethernet controller comprising:
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digital-to-analog converter means for receiving a digital control signal, and for providing an analog control signal, the digital-to-analog converter means comprising N current source means for providing current configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current source means includes a respective means for inputting; and
M delay means for delaying, an mth one of the M delaying means including means for inputting in communication with an m−
1th one of the M delay means,wherein M is equal to N−
1, andwherein means for outputting of the mth one of the M delay means controls the inputting means of an m+1th one of the N current source means, and wherein the analog control signal comprises the sum of the outputs of the N current source means; and
voltage-to-current converter means for providing a transmit signal based on the analog control signal. - View Dependent Claims (68, 69, 70, 71, 72, 73, 74)
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75. An Ethernet controller, comprising:
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digital-to-analog converter means for receiving a digital control signal, and for providing an analog control signal, the digital-to-analog converter means comprising;
N current source means for providing current configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current source means includes a respective means for inputting; and
M delay means for delaying, an mth one of the M delaying delay means including means for inputting in communication with an m−
1th one of the M delay means, wherein M is equal to N−
1, and wherein means for outputting of the mth one of the M delay means is arranged in communication with the inputting means for inputting of an m+1th one of the N current source means, andwherein the analog control signal comprises the a sum of the outputs of the N current source means;
voltage-to-current converter means for providing a transmit signal based on the analog control signal, wherein the voltage-to-current converter means provides a replica of the transmit signal;
summing means for receiving a differential composite signal comprising the transmit signal, receiving a differential replica signal comprising the replica of the transmit signal, and providing a differential difference signal representing a difference between the differential composite signal and the differential replica signal;
replicating means for producing first and second single-ended replica signals which together substantially comprise the differential replica signal; and
converting means, which is coupled to the summing means and replicating means, for producing the differential replica signal from the first and second single-ended replica signals.
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76. An Ethernet controller comprising:
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K digital-to-analog converter means each for receiving a corresponding digital control signal and each for providing a corresponding analog control signal, wherein K is at least two;
K voltage-to-current converter means each for providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and
wherein the corresponding bi-level transmit signal components of each of the K voltage-to-current converter means are combined to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (77, 78, 79, 80, 81, 82)
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83. An Ethernet controller, comprising:
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K digital-to-analog converter means each for receiving a corresponding digital control signal and each for providing a corresponding analog control signal, wherein K is at least two;
K voltage-to-current converter means each for providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals, wherein the corresponding bi-level transmit signal components of each of the K voltage-to-current converter means are combined to produce a J-level transmit signal, wherein J=K+1, wherein the K voltage-to-current converter means provide a replica of the J-level transmit signal, wherein the replica of the transmit signal comprises first and second single-ended replica signals;
converter means for producing a differential replica signal from the first and second single-ended replica signals; and
summing means, coupled to the converter means and the voltage-to-current converter means, for receiving a differential composite signal comprising the transmit signal, receiving the differential replica signal, and providing a differential difference signal representing a difference between the differential composite signal and the differential replica signal.
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84. An Ethernet controller comprising:
K digital-to-analog converter means each for receiving a corresponding digital control signal and each for providing a corresponding transmit signal component, wherein K is at least two, and wherein at least one each of the K digital-to-analog converter means comprises N current source means for providing current configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current source means includes a respective means for inputting, and M delay means for delaying, an mth one of the M delaying delay means including means for inputting in communication with an m−
1th one of the M delay means, wherein M is equal to N−
1, and wherein means for outputting of the mth one of the M delay means controls the inputting means for inputting of an m+1th one of the N current source means,wherein the corresponding transmit signal component comprises the a sum of the outputs of the N current sources; and
wherein the corresponding transmit signal components of each of the K digital-to-analog converter means are combined to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (85, 86, 87)
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88. An Ethernet controller, comprising:
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K digital-to-analog converter means each for receiving a corresponding digital control signal and each for providing a corresponding transmit signal component, wherein K is at least two, and wherein at least one each of the K digital-to-analog converter means comprises;
N current source means for providing current configured in a parallel arrangement, wherein N is at least two, and wherein each of the N current source means includes a respective means for inputting, and M delay means for delaying, an mth one of the M delaying delay means including means for inputting in communication with an m−
1th one of the M delay means,wherein M is equal to N−
1, andwherein means for outputting of the mth one of the M delay means is arranged in communication with the inputting means for inputting of an m+1th one of the N current source means, wherein the corresponding transmit signal component comprises the a sum of the outputs of the N current sources, and wherein the corresponding transmit signal components of each of the K digital-to-analog converter means are combined to produce a J-level transmit signal, wherein J=K+1; and
L digital-to-analog converter means each for receiving the corresponding digital control signal and each for providing a corresponding replica transmit signal component, wherein L=K, and wherein the corresponding replica transmit signal components of each of the L digital-to-analog converters are combined to produce a J-level replica transmit signal.
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89. A communication method comprising:
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receiving a digital control signal;
providing an analog control signal in accordance with the digital control signal, comprising supplying N sources of current, wherein N is at least two;
controlling the supply of current from each of the N sources of current;
delaying current from M of the N sources of current, where M is equal to N−
1, andwherein an output of an mth one of M delaying steps controls an m+1th one of the N sources of current; and
summing the delayed currents, wherein the analog control signal comprises the sum of the delayed currents; and
providing a transmit signal based on the analog control signal. - View Dependent Claims (90, 91, 92, 93, 94)
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95. A communication method, comprising the steps of:
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receiving a digital control signal;
providing an analog control signal in accordance with the digital control signal, comprising the steps of;
supplying N sources of current, wherein N is at least two;
controlling the supply of current from each of the N sources of current;
delaying current from M of the N sources of current, where M is equal to N−
1; and
summing the delayed currents, wherein the analog control signal comprises the a sum of the delayed currents;
providing a transmit signal based on the analog control signal;
providing a replica of the transmit signal;
receiving a differential composite signal comprising the transmit signal;
receiving a differential replica signal comprising the replica of the transmit signal;
providing a differential difference signal representing a difference between the differential composite signal and the differential replica signal;
producing first and second single-ended replica signals which together substantially comprise the differential replica signal; and
producing the differential replica signal from the first and second single-ended replica signals.
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96. A communication method comprising:
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receiving K digital control signals, wherein K is at least two;
providing a corresponding analog control signal for each of the K digital control signals;
providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and
combining the corresponding bi-level transmit signal components to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (97, 98, 99, 100)
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101. A communication method, comprising the steps of:
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receiving K digital control signals, wherein K is at least two;
providing a corresponding analog control signal for each of the K digital control signals;
providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals;
combining the corresponding bi-level transmit signal components to produce a i-level transmit signal, wherein J=K+1;
providing a replica of the J-level transmit signal, wherein the replica of the transmit signal comprises first and second single-ended replica signals;
producing a differential replica signal from the first and second single-ended replica signals; and
providing a differential difference signal representing a difference between the differential replica signal and a differential composite signal comprising the transmit signal.
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102. A communication method comprising:
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receiving K digital control signals, wherein K is at least two;
providing a corresponding transmit signal component for each of the K digital control signals, comprising supplying N sources of current, wherein N is at least two, controlling the supply of current from each of the N sources of current, delaying current from M of the N sources of current, where M is equal to N−
1, andwherein an output of an mth one of M delaying steps controls an m+1th one of the N sources of current, and summing the delayed currents, wherein the corresponding transmit signal component comprises the a sum of the delayed currents; and
combining the corresponding transmit signal components to produce a J-level transmit signal, wherein J=K+1. - View Dependent Claims (103, 104)
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105. A communication method, comprising the steps of:
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receiving K digital control signals, wherein K is at least two;
providing a corresponding transmit signal component for each of the K digital control signals, comprising the steps of;
supplying N sources of current, wherein N is at least two;
controlling the supply of current from each of the N sources of current;
delaying current from M of the N sources of current, where M is equal to N−
1; and
summing the delayed currents, wherein the corresponding transmit signal component comprises the a sum of the delayed currents;
combining the corresponding transmit signal components to produce a J-level transmit signal, wherein J=K+1;
receiving the corresponding digital control signals;
providing a corresponding replica transmit signal component for each of the corresponding digital control signals; and
combining the corresponding replica transmit signal components to produce a J-level replica transmit signal.
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106. A communication circuit, comprising:
a plurality of sets of digital-to-analog converters (DACs), wherein the plurality of sets of DACs are arranged in parallel, wherein each DAC within a set of DACs is configured to receive a digital signal and to provide an output signal, and wherein each DAC comprises;
N current sources arranged in parallel, wherein N is at least two, wherein each of the N current sources includes a respective control input, and wherein the output signal provided by each DAC comprises a sum of outputs of the N current sources; and
M delay elements, wherein an mth one of the M delay elements includes an input in communication with an m−
1th one of the M delay elements,wherein M is equal to N−
1,wherein an output of the mth one of the M delay elements controls the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the digital signal, and wherein a sum of each output signal from a respective one of the plurality of sets of DACs forms a transmit signal, and wherein a first set of the plurality of sets of DACs is configured to produce a first polarity of a differential replica signal comprising replicas of transmit signal components output by the DACs of the first set. - View Dependent Claims (107, 108, 109, 110, 111, 112, 113, 114, 115, 116)
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117. A communication circuit, comprising:
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a plurality of sets of digital-to-analog converter (DAC) means, wherein the plurality of sets of DAC means are arranged in parallel, wherein each DAC means within a set of DAC means is configured to receive a digital signal and to provide an output signal, and wherein each DAC means comprises;
N current source means arranged in parallel, wherein N is at least two, wherein each of the N current source means includes a respective means for inputting, and wherein the output signal provided by each DAC means comprises a sum of outputs of the N current source means; and
M delay means, wherein an mth one of the M delay means includes a means for inputting in communication with an m−
1th one of the M delay means,wherein M is equal to N−
1,wherein means for outputting of the mth one of the M delay means controls the inputting means for inputting of an m+1th one of the N current source means, wherein the inputting means for inputting of a first one of the M delay elements means receives the digital signal, and wherein a sum of each output signal from a respective one of the plurality of sets of DAC means forms a transmit signal, and wherein a first set of the plurality of sets of DAC means is configured to produce a first polarity of a differential replica signal comprising replicas of the transmit signal components output by the DAC means of the first set. - View Dependent Claims (118, 119, 120, 121, 122, 123, 124, 125, 126, 127)
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128. An Ethernet controller, comprising:
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a plurality of sets of transceivers, wherein the plurality of sets of transceivers are arranged in parallel, wherein each transceiver within a set of transceivers is configured to receive a digital signal and to provide an output signal, and wherein each transceiver comprises;
N current sources arranged in parallel, wherein N is at least two, wherein each of the N current sources includes a respective control input, and wherein the output signal provided by each transceiver comprises a sum of outputs of the N current sources; and
M delay elements, wherein an mth one of the M delay elements includes an input in communication with an m−
1th one of the M delay elements,wherein M is equal to N−
1,wherein an output of the mth one of the M delay elements controls the control input of an m+1th one of the N current sources, wherein an input of a first one of the M delay elements receives the digital signal, and wherein a sum of each output signal from a respective one of the plurality of sets of transceivers forms a transmit signal, and wherein a first set of the plurality of sets of transceivers is configured to produce a first polarity of a differential replica signal comprising replicas of the transmit signal components output by the transceivers of the first set. - View Dependent Claims (129, 130, 131, 132, 133, 134, 135, 136, 137, 138)
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139. An Ethernet controller, comprising:
a plurality of sets of transceiver means, wherein the plurality of sets of transceiver means are arranged in parallel, wherein each transceiver means within a set of transceiver means is configured to receive a digital signal and to provide an output signal, and wherein each transceiver means comprises;
N current source means arranged in parallel, wherein N is at least two, wherein each of the N current source means includes a respective means for inputting, and wherein the output signal provided by each transceiver means comprises a sum of outputs of the N current source means; and
M delay means, wherein an mth one of the M delay means includes a means for inputting in communication with an m−
1th one of the M delay means,wherein M is equal to N−
1,wherein means for outputting of the mth one of the M delay means controls the inputting means for inputting of an m+1th one of the N current source means, wherein the inputting means for inputting of a first one of the M delay elements means receives the digital signal, and wherein a sum of each output signal from a respective one of the plurality of sets of transceiver means forms a transmit signal, and wherein a first set of the plurality of sets of transceiver means is configured to produce a first polarity of a differential replica signal comprising replicas of transmit signal components output by the transceiver means of the first set. - View Dependent Claims (140, 141, 142, 143, 144, 145, 146, 147, 148, 149)
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150. A communication method, comprising the steps of:
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a.) receiving K digital signals, wherein K is at least two;
b.) providing K corresponding transmit signal components in accordance with each of the K digital signals, wherein for each transmit signal component, step (b) comprises the steps of;
b1.) supplying N sources of current, wherein N is at least two;
b2.) controlling the supply of current from each of the N sources of current;
b3.) delaying current from M of the N sources of current, wherein M is equal to N−
1, andwherein an output of an mth one of M delaying steps controls an m+1th one of the N sources of current; and
b4.) summing the delayed currents; and
c.) combining the K corresponding transmit signal components to produce a J-level transmit signal. - View Dependent Claims (151, 152, 153, 154, 155, 156)
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Specification