A/d converting device, a/d converting method and optical pulse testing apparatus

Abstract

An A/D converting device comprises; a plurality of A/D converters connected in parallel with each other, for carrying out a converting operation a plurality of numbers of times, in which an analog signal is converted into a digital data, a selecting circuit for selecting each A/D converter from the plurality of A/D converters at each sampling timing during the converting operation to sample the converted digital data, a selecting circuit controlling unit for controlling the selecting circuit so that when one A/D converter is selected at one sampling timing during the Nth converting operation, another A/D converter is selected at the one sampling timing during the (N+1)th converting operation, an adding circuit for integrating the digital data sampled at the one sampling timing during each converting operation, and a processing unit for processing the integrated digital data.