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http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1696188
A Micropower Chopper-Stabilized Operational Amplifier using a SC Notch Filter with Synchronous Integration inside the ContinuousTime Signal Path

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Burt, R.; Zhang, J.;
Texas Instruments, Tucson, AZ

This paper appears in: Solid-State Circuits Conference, 2006. ISSCC 2006. Digest of Technical Papers. IEEE International
Issue Date: 6-9 Feb. 2006
On page(s): 1388 - 1397
Location: San Francisco, CA
ISSN: 0193-6530
Print ISBN: 1-4244-0079-1
INSPEC Accession Number: 9122526
Digital Object Identifier: 10.1109/ISSCC.2006.1696188
Date of Current Version: 18 九月 2006

[size=1.085em]ABSTRACT

A micropower chopper-stabilized opamp uses an SC notch filter with synchronous integration inside the CT signal path to eliminate chopping noise. Characteristics include rail-to-rail I/O, 15muA supply current at 1.8 to 5.5V, 2muV offset, 55nV/radicHz noise, 350kHz GBW, and a chopping frequency of 125kHz. The die area is 0.7mm2using 0.6mum CMOS