Method and apparatus for operating a delta sigma ADC circuit
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United States of America Patent
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Oct 31, 2006
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app pub date -
Jun 10, 2005
filing date -
Jun 10, 2004
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Abstract
An analog-to-digital converter (ADC) system that converts an analog input signal into a digital output circuit includes a first stage analog-to-digital converter circuit coupled with a second stage analog-to-digital converter circuit. The first stage analog-to-digital converter circuit includes a quantizer, comparator, integrator, and a feedback digital-to-analog converter (DAC). The second stage analog-to-digital converter circuit includes a backend ADC that further quantizes the integrator output. Furthermore, the first stage analog-to-digital converter circuit also includes redundancy that corrects comparator offsets and prevents nonlinearities and harmonic distortion in the second stage analog-to-digital converter circuit caused by uncorrected comparator offsets.
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