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A low-voltage low-power CMOS opamp with rail-to-rail input/output

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2 Author(s)
Chi-Hung Lin ; Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA ; M. Ismail

In this paper, a low-voltage low-power two stage rail-to-rail CMOS opamp is presented. The input stage is composed of the complementary differential pairs and a pair of modified current-mode maximum selecting circuits (Maximum Current Selecting Circuit II) in order to achieve rail-to-rail operation and constant-gm. Using the modified constant-gm methodology, this input stage co-operated with a family of two class-AB output stages can drive a wide-range of capacitive loads with a large bandwidth-to-supply-power ratio. These opamps reach a high DC gain (≥84 dB), and have a bandwidth-to-supply-power ratio of 13 MHz/mW and 9.5 MHz/mW with capacitive loads 20 pF and 100 pF respectively.

Published in:

Circuits and Systems, 1997. Proceedings of the 40th Midwest Symposium on  (Volume:2 )

Date of Conference:

3-6 Aug. 1997