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Bipolar/CMOS (weak inversion) rail-to-rail constant-gm input stage

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2 Author(s)
V. I. Prodanov ; Dept. of Electr. Eng., State Univ. of New York, Stony Brook, NY, USA ; M. M. Green

A rail-to-rail constant-gm input stage suitable for bipolar or weak inversion CMOS implementation is presented. To achieve 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

Published in:

Electronics Letters  (Volume:33 ,  Issue: 5 )