Active resistive summer for a transformer hybrid
First Claim
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1. An electrical circuit in a communications channel comprising:
- an active resistive summer including;
an input for a composite signal, the composite signal including a transmission signal component and a receive signal component;
an input for a replica transmission signal; and
an output for a receive signal which comprises the composite signal minus the replica signal, wherein said active resistive summer includes an operational amplifier having a positive input terminal, a negative input terminal, and an output terminal, said active resistive summer further comprising;
a feedback element in communication with the output terminal and the negative input terminal;
a first resistor in communication with the negative input terminal and the composite signal; and
a second resistor in communication with the negative input terminal and the replica transmission signal.
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Abstract
An electrical circuit in a communications channel is provided. The electrical circuit includes an active resistive summer. The active resistive summer has a composite signal as an input. The composite signal includes a transmission signal component and a receive signal component. A replica transmission signal is also an input to the active resistive summer. The active resistive summer includes the receive signal component as an output.
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Citations
55 Claims
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1. An electrical circuit in a communications channel comprising:
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an active resistive summer including;
an input for a composite signal, the composite signal including a transmission signal component and a receive signal component;
an input for a replica transmission signal; and
an output for a receive signal which comprises the composite signal minus the replica signal, wherein said active resistive summer includes an operational amplifier having a positive input terminal, a negative input terminal, and an output terminal, said active resistive summer further comprising;
a feedback element in communication with the output terminal and the negative input terminal;
a first resistor in communication with the negative input terminal and the composite signal; and
a second resistor in communication with the negative input terminal and the replica transmission signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrical circuit in a communications channel comprising:
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means for summing including;
means for inputting a composite signal;
the composite signal including a transmission signal component and a receive signal component;
means for inputting a replica transmission signal; and
means for outputting a receive signal which comprises the composite signal minus the replica signal, wherein said summing means comprises means for amplifying including a positive input terminal, a negative input terminal, and an output terminal, said summing means further comprising;
feedback means for communicating with the output terminal and the negative input terminal;
first resistive means for communicating with the negative input terminal and the composite signal; and
second resistive means for communicating with the negative input terminal and the replica transmission signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of reducing a transmission signal from a composite signal in a communications channel comprising the steps of:
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inputting the composite signal into an active resistive summer, the composite signal including the transmission signal component and a receive signal component;
inputting a replica transmission signal into the active resistive summer; and
outputting a signal from the active resistive summer which comprises the composite signal minus the replica transmission signal, wherein the active resistive summer includes an operational amplifier having a positive input terminal, a negative input terminal, and an output terminal, the active resistive summer further comprising;
a feedback element in communication with the output terminal and the negative input terminal;
a first resistor in communication with the negative input terminal and the composite signal; and
a second resistor in communication with the negative input terminal and the replica transmission signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method of reducing a transmission signal from a composite signal in a communication channel, the channel including a first transceiver and a second transceiver each to transmit and receive signals, said method comprising the steps of:
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providing the composite signal, the composite signal comprising the transmission signal of the first transceiver and a receive signal of the second transceiver;
generating a replica of the transmission signal;
subtracting the replica signal from the composite signal through an active resistive summer; and
correcting baseline wander by inputting a baseline correction current into the active resistive summer. - View Dependent Claims (23)
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24. A method of correcting baseline wander in a receive signal in a communications channel having a near end and far end, the channel including a first transceiver at the near end and a second transceiver at the far end each to transmit and receive signals, said method comprising the steps of:
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providing a composite signal, the composite signal comprising a transmission signal of the first transceiver and a receive signal of the second transceiver;
generating a replica of the transmission signal;
subtracting the replica signal from the composite signal through an active resistive summer; and
providing a baseline correction current as an input to the active resistive summer. - View Dependent Claims (25, 26)
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27. An apparatus to correct baseline wander in a receive signal in a communications channel having a near end and far end, the channel including a first transceiver at the near end and a second transceiver at the far end each to transmit and receive signals, said apparatus comprising:
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a replica transmitter to generate a replica of the transmission signal; and
an active resistive summer to subtract the replica signal from a composite signal, the composite signal comprising a transmission signal of the first transceiver and a receive signal of the second transceiver, said active resistive summer including;
a first input to receive the composite signal;
a second input to receive the replica of the transmission signal; and
a third input to receive a baseline correction current. - View Dependent Claims (28, 29)
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30. An apparatus to correct baseline wander in a receive signal in a communications channel having a near and far end, the channel including a first transceiver at the near end and a second transceiver at the far end each to transmit and receive signals, said apparatus comprising:
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means for providing a composite signal, the composite signal comprising a transmission signal of the first transceiver and a receive signal of the second transceiver;
means for generating a replica of the transmission signal;
means for subtracting the replica signal from the composite signal; and
means for providing a baseline correction current as an input to the subtracting means. - View Dependent Claims (31, 32)
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33. An electrical circuit in a communications channel, comprising:
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an active resistive summer, wherein the active resistive summer comprises an operational amplifier with an inverting feedback, wherein the operational amplifier includes a positive input terminal, a negative input terminal, and an output terminal, wherein the active resistive summer includes;
an input for a composite signal, the composite signal including a transmission signal component and a receive signal component;
an input for a replica transmission signal;
an output for a receive signal which comprises the composite signal minus the replica signal;
a feedback element in communication with the output terminal and the negative input terminal;
a first resistor in communication with the negative input terminal and the composite signal; and
a second resistor in communication with the negative input terminal and the replica transmission signal. - View Dependent Claims (34, 35, 36, 37, 38, 39)
wherein the second resistor comprises a third resistor and a fourth resistor, and wherein the third resistor is in communication with the first signal and the negative input terminal and the fourth resistor is in communication with the second signal and the negative input terminal. -
36. The electrical circuit according to claim 33, wherein the active resistive summer further comprises an input for receiving a current for baseline correction.
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37. The electrical circuit according to claim 36, further comprising a charge pump to control the current for the baseline current.
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38. The electrical circuit according to claim 37, wherein the charge pump controls current based on an error between an equalized baseline signal and a sliced baseline signal.
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39. The electrical circuit according to claim 36, wherein the active resistive summer further comprises an input to receive a common-mode shift current.
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40. An electrical circuit in a communications channel, comprising:
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means for summing, wherein the summing means comprises means for amplifying with means for inverting feedback, wherein the means for amplifying including a positive input terminal, a negative input terminal, and an output terminal, wherein the summing means includes;
means for inputting a composite signal, the composite signal including a transmission signal component and a receive signal component;
means for inputting a replica transmission signal;
means for outputting a receive signal which comprises the composite signal minus the replica signal;
feedback means for communicating with the output terminal and the negative input terminal;
first resistive means for communicating with the negative input terminal and the composite signal; and
second resistive means for communicating with the negative input terminal and the replica transmission signal. - View Dependent Claims (41, 42, 43, 44, 45, 46)
wherein the second resistive means comprises a third resistive means and a fourth resistive means, and wherein the third resistive means is for communicating with the first signal and the negative input terminal and the fourth resistive means is for communicating with the second signal and the negative input terminal. -
43. The electrical circuit according to claim 40, wherein the summing means further comprises means for receiving a current for baseline correction.
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44. The electrical circuit according to claim 43, further comprising means for pumping to control the current for the baseline current.
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45. The electrical circuit according to claim 44, wherein the pumping means controls current based on an error between an equalized baseline signal and a sliced baseline signal.
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46. The electrical circuit according to claim 43, wherein the summing means further comprises means for receiving a common-mode shift current.
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47. A method of reducing a transmission signal from a composite signal in a communications channel, comprising the steps of:
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inputting the composite signal into an active resistive summer, the composite signal including the transmission signal component and a receive signal component, wherein the active resistive summer includes an operational amplifier with inverting feedback, wherein the operational amplifier includes a positive input terminal, a negative input terminal, and an output terminal;
inputting a replica transmission signal into the active resistive summer; and
outputting a signal from the active resistive summer which comprises the composite signal minus the replica transmission signal, wherein the active resistive summer further includes;
a feedback element in communication with the output terminal and the negative input terminal;
a first resistor in communication with the negative input terminal and the composite signal; and
a second resistor in communication with the negative input terminal and the replica transmission signal. - View Dependent Claims (48, 49, 50, 51, 52, 53)
wherein the second resistor comprises a third resistor and a fourth resistor, and wherein the third resistor is in communication with the first signal and the negative input terminal and the fourth resistor is in communication with the second signal and the negative input terminal. -
50. The method according to claim 49, further comprising the step of inputting a current into the active resistive summer to correct baseline wander.
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51. The method according to claim 50, further comprising the step of controlling the current for correcting the baseline wander with a charge pump.
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52. The method according to claim 51, wherein the charge pump controls current based on an error between an equalized baseline signal and a sliced baseline signal.
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53. The method according to claim 50, further comprising the step of inputting a common-mode shift current into the active resistive summer.
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54. A method of reducing a transmission signal from a composite signal in a communication channel, the channel including a first transceiver and a second transceiver each to transmit and receive signals, the method comprising the steps of:
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providing the composite signal, the composite signal comprising the transmission signal of the first transceiver and a receive signal of the second transceiver, generating a replica of the transmission signal;
subtracting the replica signal from the composite signal through an active resistive summer, wherein the active resistive summer includes an operational amplifier with inverting feedback; and
correcting baseline wander by inputting a baseline correction current into the active resistive summer. - View Dependent Claims (55)
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Specification