PROBLEM TO BE SOLVED: To improve accuracy of A/D conversion.SOLUTION: An A/D conversion device comprises: a deviation signal generator 20 that generates n deviation signals &deltak (where n is a natural number larger than or equal to two) having mutually different levels a deviation signal controller 10 that controls the deviation signal generator 20 a deviation signal adder 30 that sequentially adds an input analog signal Cin and n deviation signals &deltak to generate n first signals S1 an A/D converter 40 that perform A/D conversion of the n first signals S1 to generate n second signals S2 and a signal processor 50 that performs average processing of the n second signals S1 to generate an output digital signal Cout.COPYRIGHT: (C)2012,JPO&INPIT【課題】AD変換の精度を向上させる。【解決手段】AD変換装置1は、大きさが互いに異なるn(nは2以上の自然数)個の偏移信号δkを生成する偏移信号生成部20と、偏移信号生成部20を制御する偏移信号制御部10と、入力アナログ信号Cinとn個の偏移信号δkとを順次加算してn個の第1信号S1を生成する偏移信号加算部30と、n個の第1信号S1をAD変換してn個の第2信号S2を生成するAD変換部40と、n個の第2信号S1に平均処理を施して出力デジタル信号Coutを生成する信号処理部50とを備える。【選択図】 図1
