Patent Document ID: 4734678
Application ID: 07022045
Patent Flag: 1

Claim One:
1. A high-resolution A/D converter which comprises: a first D/A converter; a switch for selecting an output signal of said first D/A converter and an analog input signal; a second D/A converter; an adder which performs the addition or subtraction of a signal that has passed through said switch and an output signal of said second D/A converter; an amplifier for amplifying the output signal of said adder; an A/D converter for converting the output signal of said amplifier into a digital value; and a processor which reads the output of said A/D converter and give input values to said first and second D/A converters; wherein said processor stores all minimum bit widths of said first and second D/A converters, when said first D/A converter is selected as an input by said switch, and corrects the digital output value when the analog signal is selected as an input by said switch.