High-Gain Class-AB OTA with Low Quiescent Current

Authors:
Jeongjin Roh
Affiliations:
Department of Electrical Engineering and Computer Science, Hanyang University, Ansan, Korea
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2006

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Modeling and designing of high-gain, wide-band and fast-speed operational transconductance amplifier

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Abstract

High-performance operational transconductance amplifier (OTA) is designed for switched-capacitor applications. Without using a cascoded output stage, which limits the voltage swing, the output resistance is significantly increased for high DC gain by accurately controlling the output current. Also, the output stage has class-AB operation, so the overall power efficiency is improved. With significantly low quiescent current, the presented new OTA achieves higher DC gain than conventional OTAs. Theoretical analysis and HSPICE simulations prove the performance of the new OTA.