Patent ID: 7091894
Filing Date: 2006-08-15
Classification: H03M

Abstract:
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 components; 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.