Removing electrical noise in systems with ADCs
First Claim
1. A system comprising:
- a plurality of analog-to-digital converters (ADCs) configured to each receive an input analog signal and to output a digital signal;
a cross-correlator coupled to the output of each of the plurality of ADCs;
an adaptive filter coupled to an output of the cross-correlator, wherein information of the cross-correlator controls a passband of the adaptive filter, and a summing device including inputs coupled to the plurality of ADCs and a summing device output coupled to the adaptive filter, wherein the summing device is configured to provide at the summing device output a first signal by adding the digital signals output from the plurality of ADCs.
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Abstract
Signal processing systems and methods are described that include a multi-analog receiver front end with adaptive filtering. The multi-analog receiver front end uses two or more analog-to-digital converters (ADCs) to remove additive electrical noise present in the analog front end. The multiple ADCs are followed in the signal processing path by digital statistical signal processing. The multi-analog receiver front end adaptively determines the passband of a digital filter in a system with input signals having a wide frequency range of interest, and controls filtering of the input signals to the narrow frequency range that includes an input signal. The multi-analog receiver front end, through removal of additive noise, provides higher signal-to-noise ratios for a given power dissipation and chip area when compared to receiver front ends which do not use the multiple ADCs.
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Citations
23 Claims
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1. A system comprising:
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a plurality of analog-to-digital converters (ADCs) configured to each receive an input analog signal and to output a digital signal;
a cross-correlator coupled to the output of each of the plurality of ADCs;
an adaptive filter coupled to an output of the cross-correlator, wherein information of the cross-correlator controls a passband of the adaptive filter, and a summing device including inputs coupled to the plurality of ADCs and a summing device output coupled to the adaptive filter, wherein the summing device is configured to provide at the summing device output a first signal by adding the digital signals output from the plurality of ADCs. - View Dependent Claims (3, 4, 5, 6, 7)
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2. (canceled)
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8. A signal processing system comprising:
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circuitry configured to generate a plurality of digital signals from a received analog signal;
circuitry configured to generate from the plurality of digital signals statistical estimates of the analog signal and to adaptively control in real-time a passband to a frequency range including the analog signal;
circuitry configured to filter using the passband a signal that is a sum of the plurality of digital signals to generate an output signal having reduced additive noise; and
circuitry configured to generate a first signal that is a an additive sum of the plurality of digital signals. - View Dependent Claims (10, 11, 12, 13, 14)
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9. (canceled)
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15. A method for controlling a filter for processing signals, comprising:
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converting an analog signal to a plurality of digital signals;
cross-correlating the plurality of digital signals;
adding the plurality of digital signals to form a first signal; and
adaptively controlling a filter passband with information of the cross-correlating, wherein the first signal is filtered using the filter passband to output a filtered signal, wherein electrical noise of the filtered signal is reduced. - View Dependent Claims (16, 17, 18, 19, 20, 22)
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21. (canceled)
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23. A method for controlling a filter for processing signals, comprising:
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converting an analog signal to a plurality of digital signals, wherein each digital signal represents the analog signal;
estimating an autocorrelation function of the plurality of digital signals;
adding the plurality of digital signals to form a first signal;
determining filter coefficients using one or more of information of the autocorrelation function and difference information of the plurality of digital signals; and
adaptively controlling a filter passband using the filter coefficients during filtering of the first signal.
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Specification