Postprint version. Published in Institution of Engineering and Technology Electronics Letters, Volume 33, Issue 5, February 1, 1997, pages 386-387.
This paper is a postprint of a paper submitted to and accepted for publication in Electronics Letters and is subject to Institution of Engineering and Technology Copyright. The copy of record is available in the IET Digital Library at http://dx.doi.org/10.1049/el:19970263 .
NOTE: At the time of publication, the author Vladimir Prodanov was not yet affiliated with Cal Poly.
A rail-to-rail constant-gm input stage suitable for bipolar or weak inversion CMOS implementation is presented. To achwe rail-to rail operation, two complementary differential pairs driven in parallel are used. To guarantee constant net transconductance each differential pair is augmented with a suitable biasing circuit. The biasing circuits are implemented without current mirrors, which results in low sensitivity to process variations and potentially higher bandwidth.
Electrical and Computer Engineering