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Method and apparatus for calibrating comparator offset of successive-approximation-register analog-to-digital converter
Method and apparatus for calibrating comparator offset of successive-approximation-register analog-to-digital converter
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机译:校准逐次逼近寄存器模数转换器的比较器偏移的方法和装置
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摘要
A circuit and method compensates for comparator offset in a successive approximation register analog-to-digital converter. The circuit includes a multiplexed sampler to sample either a common mode voltage or an input signal. The sampled signal is added to a conversion voltage and an offset correction voltage and input to a comparator. The comparator determines a polarity of deviation of the sum of the sampled signal, conversion voltage and off-set correction voltage. Based on the polarity, the offset correction voltage and the conversion voltage are alternately subjected to a successive approximation process to compensate for the offset of the sum from the sampled input signal or sampled common voltage signal.
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