SYSTEMS AND METHODS FOR ANALOG TO DIGITAL CONVERSION
First Claim
1. An analog to digital conversion system having an analog input and a digital output, said system comprising:
- a signal analog to digital conversion (ADC) component having an analog signal input coupled to said analog input of said system and a digital signal output coupled to said digital output of said system;
a signal cancellation digital to analog conversion (DAC) component having a digital signal input and an analog signal output, said analog signal output being coupled between said input of said analog to digital conversion system and said analog input of said signal ADC component; and
digital feedback circuitry having a digital signal input coupled to said digital signal output of said signal ADC component, and having a digital signal output coupled to said cancellation DAC component;
wherein said analog input of said system is configured to receive a system analog input signal that is of sufficient strength to at least partially saturate said signal ADC component;
wherein said signal cancellation DAC is configured to provide an analog cancellation signal for combination with said system analog input signal to produce a modified analog input signal that does not saturate said signal ADC component;
wherein said analog to digital conversion system comprises an interference cancellation system;
wherein said system analog input signal comprises at least one desired signal in the presence of at least one interfering signal, and wherein said analog to digital conversion system is configured to provide a digital output signal based at least in part on said desired signal present in said system analog input signal;
wherein said signal cancellation DAC component is configured to provide said analog cancellation signal based on a digital feedback signal received from said digital feedback circuitry said analog cancellation signal being effective to at least partially cancel said at least one interfering signal in said system analog input signal when combined with said system analog input signal so as to produce said modified analog input signal;
wherein said signal ADC component is configured to produce a digital output signal based on said modified analog input signal, and to provide said digital output signal to said digital signal input of said digital feedback circuitry and to said digital output of said system; and
wherein said digital feedback circuitry is configured to produce said digital feedback signal based at least in part on said digital output signal produced by said signal ADC component.
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Abstract
Systems and methods for analog to digital conversion that may be implemented using a digital to analog converter (DAC) to provide negative feedback to at least Partially cancel one or more signals (e.g., one or more interfering signals present with one or more desired signals, one or more strong desired signals etc.) at the analog input of an analog to digital converter (ADC), and that may be used to extend the effective dynamic range of an ADC. The effective dynamic range of an ADC may be extended by detecting and isolating signals and using digital adaptive digital filtering along with a digital to analog converter (DAC) to provide negative feedback to cancel the signal/s at the input of the ADC.
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Citations
63 Claims
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1. An analog to digital conversion system having an analog input and a digital output, said system comprising:
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a signal analog to digital conversion (ADC) component having an analog signal input coupled to said analog input of said system and a digital signal output coupled to said digital output of said system;
a signal cancellation digital to analog conversion (DAC) component having a digital signal input and an analog signal output, said analog signal output being coupled between said input of said analog to digital conversion system and said analog input of said signal ADC component; and
digital feedback circuitry having a digital signal input coupled to said digital signal output of said signal ADC component, and having a digital signal output coupled to said cancellation DAC component;
wherein said analog input of said system is configured to receive a system analog input signal that is of sufficient strength to at least partially saturate said signal ADC component;
wherein said signal cancellation DAC is configured to provide an analog cancellation signal for combination with said system analog input signal to produce a modified analog input signal that does not saturate said signal ADC component;
wherein said analog to digital conversion system comprises an interference cancellation system;
wherein said system analog input signal comprises at least one desired signal in the presence of at least one interfering signal, and wherein said analog to digital conversion system is configured to provide a digital output signal based at least in part on said desired signal present in said system analog input signal;
wherein said signal cancellation DAC component is configured to provide said analog cancellation signal based on a digital feedback signal received from said digital feedback circuitry said analog cancellation signal being effective to at least partially cancel said at least one interfering signal in said system analog input signal when combined with said system analog input signal so as to produce said modified analog input signal;
wherein said signal ADC component is configured to produce a digital output signal based on said modified analog input signal, and to provide said digital output signal to said digital signal input of said digital feedback circuitry and to said digital output of said system; and
wherein said digital feedback circuitry is configured to produce said digital feedback signal based at least in part on said digital output signal produced by said signal ADC component. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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2. (canceled)
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12. An analog to digital conversion system having a system analog input for receiving a system analog input signal and a system digital output for providing a system digital output signal, said system comprising:
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a signal analog to digital conversion (ADC) component having an analog signal input coupled to said system analog input and a digital signal output coupled to said system digital output;
a signal cancellation digital to analog conversion (DAC) component having a digital signal input and an analog signal output, said analog signal output being coupled between said system analog input and said analog input of said signal ADC component; and
digital feedback circuitry comprising a cancellation ADC component coupled to said system analog input, said digital feedback circuitry having a digital signal input coupled to said digital signal output of said signal ADC component, and a digital signal output coupled to said cancellation DAC component. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for analog to digital conversion of a signal, comprising:
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combining an analog input signal with an analog cancellation signal to form a modified analog input signal;
converting said modified analog input signal to a digital output signal in a first analog to digital conversion (ADC) component;
producing a digital feedback signal based at least in part on said digital output signal; and
converting said digital feedback signal to said analog cancellation signal;
wherein said analog input signal has a signal strength sufficient to at least partially saturate said first ADC component, and wherein said modified analog input signal has a signal strength that is not sufficient to saturate said first ADC component;
wherein said analog input signal comprises at least one desired signal in the presence of at least one interfering signal, and wherein said digital output signal is based at least in part on said desired signal present in said analog input signal; and
wherein said analog cancellation signal is effective to at least partially cancel said at least one interfering signal in said analog input signal to produce said modified analog input signal. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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28. (canceled)
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38. A method for analog to digital conversion of a signal, comprising:
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combining an analog input signal with an analog cancellation signal to form a modified analog input signal;
converting said modified analog input signal to a digital output signal;
producing a digital feedback signal based at least in part on said digital output signal and on at least one analog signal that is based at least in part on said analog input signal; and
converting said digital feedback signal to said analog cancellation signal. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. An analog to digital conversion system having an analog input and a digital output, said system comprising:
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a signal analog to digital conversion (ADC) component having an analog signal input coupled to said analog input of said system and a digital signal output coupled to said digital output of said system;
a signal cancellation digital to analog conversion (DAC) component having a digital signal input and an analog signal output, said analog signal output being coupled between said input of said analog to digital conversion system and said analog input of said signal ADC component; and
digital feedback circuitry having a digital signal input coupled to said digital signal output of said signal ADC component, and having a digital signal output coupled to said cancellation DAC component;
wherein said analog input of said system is configured to receive a system analog input signal that is of sufficient strength to at least partially saturate said signal ADC component;
wherein said signal cancellation DAC is configured to provide an analog cancellation signal for combination with said system analog input signal to produce a modified analog input signal that does not saturate said signal ADC component; and
wherein said digital feedback circuitry further comprises at least one analog signal input coupled to receive said system analog input signal or said modified analog input signal; and
wherein said digital feedback circuitry is further configured to produce said digital feedback signal based at least in part on said system analog input signal, said modified analog input signal received by said at least one analog signal input of said digital feedback circuitry, or a combination thereof.
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53. An analog to digital conversion system having an analog input and a digital output, said system comprising:
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a signal analog to digital conversion (ADC) component having an analog signal input coupled to said analog input of said system and a digital signal output coupled to said digital output of said system;
a signal cancellation digital to analog conversion (DAC) component having a digital signal input and an analog signal output, said analog signal output being coupled between said input of said analog to digital conversion system and said analog input of said signal ADC component; and
digital feedback circuitry having a digital signal input coupled to said digital signal output of said signal ADC component, and having a digital signal output coupled to said cancellation DAC component;
wherein said analog input of said system is configured to receive a system analog input signal that is of sufficient strength to at least partially saturate said signal ADC component;
wherein said signal cancellation DAC is configured to provide an analog cancellation signal for combination with said system analog input signal to produce a modified analog input signal that does not saturate said signal ADC component; and
wherein said digital feedback circuitry further comprises a cancellation ADC component coupled to receive said modified analog input signal; and
wherein said digital feedback circuitry is further configured to produce said digital feedback signal based at least in part on said modified analog input signal received by said cancellation ADC component of said digital feedback circuitry.
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54. An analog to digital conversion system having an analog input and a digital output, said system comprising:
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a signal analog to digital conversion (ADC) component having an analog signal input coupled to said analog input of said system and a digital signal output coupled to said digital output of said system;
a signal cancellation digital to analog conversion (DAC) component having a digital signal input and an analog signal output, said analog signal output being coupled between said input of said analog to digital conversion system and said analog input of said signal ADC component; and
digital feedback circuitry having a digital signal input coupled to said digital signal output of said signal ADC component, and having a digital signal output coupled to said cancellation DAC component;
wherein said analog input of said system is configured to receive a system analog input signal that is of sufficient strength to at least partially saturate said signal ADC component;
wherein said signal cancellation DAC is configured to provide an analog cancellation signal for combination with said system analog input signal to produce a modified analog input signal that does not saturate said signal ADC component; and
wherein said digital feedback circuitry further comprises a cancellation ADC component coupled to receive said system analog input signal; and
wherein said digital feedback circuitry is further configured to produce said digital feedback signal based at least in part on said system analog input signal received by said cancellation ADC component of said digital feedback circuitry. - View Dependent Claims (55)
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56. An analog to digital conversion system having an analog input and a digital output, said system comprising:
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a signal analog to digital conversion (ADC) component having an analog signal input coupled to said analog input of said system and a digital signal output coupled to said digital output of said system;
a signal cancellation digital to analog conversion (DAC) component having a digital signal input and an analog signal output, said analog signal output being coupled between said input of said analog to digital conversion system and said analog input of said signal ADC component; and
digital feedback circuitry having a digital signal input coupled to said digital signal output of said signal ADC component, and having a digital signal output coupled to said cancellation DAC component;
wherein said analog input of said system is configured to receive a system analog input signal that is of sufficient strength to at least partially saturate said signal ADC component;
wherein said signal cancellation DAC is configured to provide an analog cancellation signal for combination with said system analog input signal to produce a modified analog input signal that does not saturate said signal ADC component; and
wherein said analog to digital conversion system comprises an interference cancellation system; and
wherein said digital feed back circuitry comprises at least one signal cancellation component configured to produce said digital feedback signal, and at least one signal cancellation control component coupled to said digital signal input of said digital feedback circuitry and configured to control said signal cancellation component to produce said digital feedback signal based at least in part on said digital output signal received from said signal ADC component. - View Dependent Claims (57)
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58. A method for analog to digital conversion of a signal, comprising:
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combining an analog input signal with an analog cancellation signal to form a modified analog input signal;
converting said modified analog input signal to a digital output signal in a first analog to digital conversion (ADC) component;
producing a digital feedback signal based at least in part on said digital output signal;
producing said digital feedback signal based at least in part on said analog input signal, said modified analog input signal, or a combination thereof; and
converting said digital feedback signal to said analog cancellation signal;
wherein said analog input signal has a signal strength sufficient to at least partially saturate said first ADC component, and wherein said modified analog input signal has a signal strength that is not sufficient to saturate said first ADC component.
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59. A method for analog to digital conversion of a signal, comprising:
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combining an analog input signal with an analog cancellation signal to form a modified analog input signal;
converting said modified analog input signal to a digital output signal in a first analog to digital conversion (ADC) component;
producing a digital feedback signal based at least in part on said digital output signal;
producing said digital feedback signal using a second ADC component and based at least in part on said modified analog input signal; and
converting said digital feedback signal to said analog cancellation signal;
wherein said analog input signal has a signal strength sufficient to at least partially saturate said first ADC component, and wherein said modified analog input signal has a signal strength that is not sufficient to saturate said first ADC component.
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60. A method for analog to digital conversion of a signal, comprising:
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combining an analog input signal with an analog cancellation signal to form a modified analog input signal;
converting said modified analog input signal to a digital output signal in a first analog to digital conversion (ADC) component;
producing a digital feedback signal based at least in part on said digital output signal;
producing said digital feedback signal using a second ADC component and based at least in part on said analog input signal; and
converting said digital feedback signal to said analog cancellation signal;
wherein said analog input signal has a signal strength sufficient to at least partially saturate said first ADC component, and wherein said modified analog input signal has a signal strength that is not sufficient to saturate said first ADC component. - View Dependent Claims (61)
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62. A method for analog to digital conversion of a signal, comprising:
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combining an analog input signal with an analog cancellation signal to form a modified analog input signal;
converting said modified analog input signal to a digital output signal in a first analog to digital conversion (ADC) component;
producing a digital feedback signal based at least in part on said digital output signal;
producing said digital feedback signal using digital feed back circuitry, said digital feedback circuitry comprising at least one signal cancellation component configured to produce said digital feedback signal, and at least one signal cancellation control component configured to control said signal cancellation component to produce said digital feedback signal based at least in part on said digital output signal received from said ADC component;
converting said digital feedback signal to said analog cancellation signal; and
wherein said analog input signal has a signal strength sufficient to at least partially saturate said first ADC component, and wherein said modified analog input signal has a signal strength that is not sufficient to saturate said first ADC component. - View Dependent Claims (63)
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Specification