A CMOS Chopper Offset-Stabilized Opamp

descriptionPublicationkeyboard_double_arrow_right Article 01 Sep 2006Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:IEEE Journal of Solid-State Circuits, volume 42, pages 1,529-1,535 (issn: 0018-9200,

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Authors: Johan F. Witte; Kofi A. A. Makinwa; Johan H. Huijsing;

doi: 10.1109/jssc.2007.899080 , 10.1109/esscir.2006.307605

A CMOS Chopper Offset-Stabilized Opamp

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Abstract

In this paper we introduce an offset-stabilized operational amplifier that uses a chopper amplifier in a low frequency path to cancel the offset of a wide-bandwidth amplifier. A sample-and-hold circuit is used to reduce the chopper ripple, and the low frequency path is also offset-stabilized to further reduce the residual offset. The amplifier has 1muV offset at a 4 kHz chopper frequency, and a unity gain frequency of 1.3MHz with a 50pF load. The amplifier was realized in a 0.7mum CMOS process, and has an effective chip area of 3.6mm2

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