Pipeline-type analog-to-digital converter

Details Pipeline-type analog-to-digital converter Pipeline-type analog-to-digital converter

2009-03-18

2010-10-26

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S161000, C341S162000, C341S172000

Reexamination Certificate

active

07821433

ABSTRACT:
A pipeline-type A/D converter includes: N number of stages cascade-connected; and a digital correction circuit that receives digital signals outputted from the N number of stages and outputs a final digital signal. In the converter, an Mth stage in the N number of stages includes: a sub A/D converter A/D-converting an input analog signal; a sub D/A converter D/A converting a digital signal outputted from the sub A/D converter; a differential amplifier circuit that includes a sample hold circuit and an operational amplifier, performs an sampling operation and a holding operation to obtain a difference between the input analog signal and an output signal of the sub D/A converter, and amplifies the difference; and a compensation circuit compensating a gain error of the operational amplifier in an operation of the differential amplifier circuit, the gain error being caused by parasitic capacitance between an input terminal and an output terminal of the operational amplifier, and 1≦M<N.

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