Patent ID: 7646324
Filing Date: 2010-01-12
Classification: H03M

Abstract:
1. A pipeline type analog-digital converter comprising: a first to an N-th (N is an integer of not less than 2) stages brought into cascade connection and respectively converting an analog signal input from a preceding stage to a digital signal having a predetermined bit and outputting the digital signal, each of the first to the (N−1)-th stages comprising an analog-digital converter circuit including a first to an M-th (M being an integer of not less than 2) comparators comparing an analog signal with a first to an M-th reference potential being determined in advance and mutually different in parallel, and at least one stage of the first to the (N−1)-th stages comprising an auxiliary comparator; and a comparator selection circuit outputting a comparator selection signal to selectively activate one of the comparators, wherein: when a comparator of said first to M-th comparators is determined to be a comparator with an offset exceeding a tolerance, the comparator with the offset exceeding the tolerance is replaced by said auxiliary comparator, based on the comparator selection signal.