Analog-Digital Converter and Control Method

摘要

In an example embodiment, an analog-digital converter includes digital-analog converter, a comparator, and a register. The digital-analog converter is configured to output a differential voltage between a reference voltage and a voltage of an analog signal. The comparator is configured to output a comparison signal corresponding to the differential voltage output by the digital-analog converter. The register is configured to cause the digital-analog converter to generate N pairs of differential voltages (N≧1), to cause the digital-analog converter to generate an (N+1)th pair of differential voltages by causing one of a positive side and a negative side of the digital-analog converter to output an (N+1)th differential voltage and causing the other of the positive side and the negative side to output a differential voltage equal to the Nth differential voltage as an (N+1)th differential voltage, and to output a digital signal corresponding to a comparison signal having a smallest voltage among (N+1) comparison signals.

主权项

1. An analog-digital converter comprising:
a digital-analog converter configured to output a differential voltage between a reference voltage and a voltage of an analog signal; a comparator configured to output a comparison signal corresponding to the differential voltage output by the digital-analog converter; and a register configured to cause the digital-analog converter to generate N pairs of differential voltages, where N is an integer greater than or equal to one, to cause the digital-analog converter to generate an (N+1)th pair of differential voltages by causing one of a positive side and a negative side of the digital-analog converter to output an (N+1)th differential voltage and causing the other of the positive side and the negative side to output a differential voltage equal to an Nth differential voltage as an (N+1)th differential voltage, and to output a digital signal corresponding to a smallest comparison signal having a smallest voltage among (N+1) of the comparison signals.