Highly accurate a/d converter

Details Highly accurate a/d converter Highly accurate a/d converter

H - Electricity

03

M

H03M 1/18 (2006.01) H03M 1/08 (2006.01)

Patent

CA 2272805

An A/D converter provides a high conversion accuracy even when an input analog signal is at a low level. The A/D converter (10) comprises a first line including a first A/D conversion unit (ADC1) connected to an input terminal (1) applied with an analog signal, a second line including a first amplifier (AMP1) connected to the input terminal (1) and having an amplification ratio of 2m (m > 0), a second A/D conversion unit (ADC2), and a second amplifier (AMP2) having an amplification ratio of 2-m, and a combination of a switch and a level detector (SW, LDET) for connecting an output of the first line or an output of the second line to an output terminal (2) in accordance with an output level of the first line.

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