Gain and Bandwidth Enhanced Class-AB OTAs

Abstract

Efficient class-AB OTAs with enhanced gain bandwidth, open loop gain, output current, and slew rate are presented. They are based on a gm-boosting technique (at least factor of two) and also use dynamically biased cascode transistors to achieve high gain and output currents much larger than the bias current. Measurement results of 180 nm CMOS test chip prototypes validate the improvements.