IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
High current efficiency class-AB OTA with high open loop gain and enhanced bandwidth
Shirin PourashrafJaime Ramirez-AnguloAlejandro Roman-LoeraAntonio J. Lopez-MartinAlejandro Diaz-SanchezRamon G. Carvajal
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Volume 14 (2017) Issue 17 Pages 20170719

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Abstract

An efficient class-AB OTA with enhanced output current, slew rate, open loop gain, and gain bandwidth is presented. The circuit is based on a class-AB input stage with adaptive biasing, and an output stage with dynamically biased cascode transistors. It can deliver output currents 100 times larger than the bias current with a total quiescent power dissipation of 72 µW. Measurement results of a 180 nm CMOS test chip prototype show slew rate, gain bandwidth, and open loop gain enhancement.

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© 2017 by The Institute of Electronics, Information and Communication Engineers
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