A Power-Efficient CMOS Adaptive Biasing Operational Transconductance Amplifier.

This paper presents a two-stage power-efficient class-AB operational transconductance amplifier (OTA) based on an adaptive biasing circuit suited to low-power dissipation and low-voltage operation. The OTA shows significant improvements in driving capability and power dissipation owing to the novel adaptive biasing circuit. The OTA dissipates only 0.4 µW from a supply voltage of ±0.6 V and exhibits excellent high driving, which results in a slew rate improvement of more than 250 times that of the conventional class-AB amplifier. The design is fabricated using 0.18-µm CMOS technology. [ABSTRACT FROM AUTHOR]