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US08736471B2 Methods and apparatus for calibrating stages in pipeline analog-to-digital converters 有权
管道模数转换器校准阶段的方法和装置

Methods and apparatus for calibrating stages in pipeline analog-to-digital converters
Abstract:
A calibration control circuit is provided for calibrating a stage in a pipeline analog-to-digital converter (ADC). The stage includes an analog-to-digital subconverter (ADSC) and a multiplying digital-to-analog converter (MDAC). The calibration control circuit includes circuitry coupled to comparators in the ADSC to force the comparators to output a predetermined digital output signal set by a calibration control signal when the ADC is in a calibration mode to thereby control reference switches in an analog multiplexer (AMUX) to selectively apply reference voltages to capacitors in the MDAC to obtain a predetermined stage residue signal.
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