A CMOS chopper offset-stabilized opamp

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Abstract

In this paper, an offset-stabilized operational amplifier is described. The amplifier employs 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 less than 1.5 offset at a 16-kHz chopper frequency, a unity gain frequency of 1.3 MHz with a 50-pF load, and draws 700 from a 5-V supply. The amplifier was realized in a 0.7 CMOS process, and has an effective chip area of 3.6.
Original languageUndefined/Unknown
Pages (from-to)1529-1535
Number of pages7
JournalIEEE Journal of Solid State Circuits
Volume42
Issue number7
DOIs
Publication statusPublished - 2007

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