Patent ID: 6664911
Filing Date: 2003-12-16
Classification: H03M

Abstract:
A differential input A/D converter which converts a potential difference between two analog input signals from an analog value to a digital value, comprising:first A/D conversion means for outputting a first conversion result obtained by A/D-converting a first analog input signal; second A/D conversion means for outputting a second conversion result obtained by A/D-converting a second analog input signal; and digital subtraction means for outputting a differential conversion result obtained by subtracting the second conversion result output from said second A/D conversion means from the first conversion result output from said first A/D conversion means, wherein the first A/D conversion means A/D-converts a difference between an analog value obtained from an output of said second A/D conversion means and the second analog input signal output from said second A/D conversion means and superimposes the A/D conversion result on the first conversion result.