An input capacitor and a plurality of reference capacitors sample an input voltage and reference voltages in a first period. A switch circuit connects the input capacitor and one of the reference capacitors between an output and an input of an amplifier in a second period. This mechanism causes a feedback gain to be "1" in the second period. Therefore, it is possible to reduce power consumption and noise.

 
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> Error measuring method for digitally self-calibrating pipeline ADC and apparatus thereof

> Method of time synchronization of multiple A/D sample data records
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