IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL SC-19, NO 6, DECEMBER 1984 919
Design Techniques for Cascoded CMOS Op Amps with Improved PSRR and Common-Mode Input Range
By DAVID B RIBNER AND MILES A. COPELAND
Abstract —Intemafly compensated CMOS op amps have ~en widely
used in sampled-analog signaf processing applications over the past several
years; however, the popular two-stage op amp suffers from poor ac power
supply rejection to one of the power rails. This paper presents two circuits
that overcome the PSRR problems of the earlier amplifiec one for virtual
ground applications such as switched-capacitor integrators, and the other
for buffer applications requiring wide common-mode input range. Small
signal an@ysis is developed for the open loop and PSRR responses of the
two amplifiers. In addition, design guidelines are suggested and test results
are presented. |
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