High current efficiency class-AB OTA with high open loop gain and enhanced bandwidth

IEICE Electronics Express

Alejandro Roman-Loera¹  Antonio J. Lopez-Martin²  Ramon G. Carvajal³  Alejandro Diaz-Sanchez⁴  Shirin Pourashraf⁵  Jaime Ramirez-Angulo⁵ 

[1] Autonomous University of Aguascalientes;Department of Electrical and Electronic Engineering, Public University of Navarra;Department of Electronic Eng., University of Seville;Instituto Nacional de Astrofisica, Optica Electronica;Klipsch School of Electrical and Computer Engineering Department, New Mexico State University

关键词: class-AB;    OTA;    current efficiency;   

DOI  :  10.1587/elex.14.20170719

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

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.

【 授权许可】

CC BY