Patent ID: 7061420
Filing Date: 2006-06-13
Classification: H03M

Abstract:
1. An analog-digital converter comprising a basic unit for each of the converter's stages, said basic unit comprising: an analog-digital converter circuit converting an analog signal input to the unit's stage into a digital value of a predetermined number of bits; a digital-analog converter circuit converting an output from the analog-digital converter into an analog signal; a subtracter circuit subtracting an output from the digital-analog circuit from the analog signal input to the unit's stage or from an output analog signal from an amplifier amplifying the analog signal input to the unit's stage by a predetermined gain, wherein a target digital signal from the analog-digital converter is obtained by using the basic unit once or in repeated sequences, and a gain of at least one amplifier circuit included in the analog-digital converter is set to be below 1.