A Power-Efficient CMOS Adaptive Biasing Operational Transconductance Amplifier

作者：Torfifard Jafar^*; Bin Rain Abu Khari

来源：ETRI Journal, 2013, 35(2): 226-233.

DOI：10.4218/etrij.13.0112.0300

• Adaptive biasing
• CMOS operational transconductance amplifier (OTA)
• class-AB amplifiers
• low power
• low voltage

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 mu W 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-mu m CMOS technology.

• 出版日期2013-4