Design Techniques for Cascoded CMOS_DAVID B RIBNER AND MILES A. COPELAND

heyunpro

Abstract —Intemally compensated CMOS op amps have been 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 [email=an@ysis]an@ysis[/email] 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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