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A low-voltage CMOS rail-to-rail class-AB input/output opamp with slew-rate and settling enhancement

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

A low-voltage CMOS rail-to-rail op amp with high slew-rate and fast-settling is presented. The input stage is composed of the complementary differential pairs, a pair of modified current-mode maximum selecting circuits (Maximum Current Selecting Circuit II) and a class-AB feedback loop circuit. It achieves rail-to-rail operation, constant-gm, high slew-rate and fast-settling. With this opamp topology, the design can be easily performed for a wide-range of capacitive loads with a large bandwidth-to-power-consumption ratio. With 2 μm and 0.5 μm technology respectively, the op amp has a high DC gain (⩾84 dB), and has a bandwidth-to-power-consumption ratio of 13.6 MHz/mW and 25.8 MHz/mW with capacitive loads of 20 pF, 86 V/μs, S0 V/μs slew-rate and 159 ns, 36 ns settling-time

Published in:

Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on  (Volume:1 )

Date of Conference:

31 May-3 Jun 1998