Authors: Galan, J.; Carvajal, Ramón G.; Ramírez-Angulo, J.; López-Martín, Antonio J.; Rubia-Marcos, C.

Source: Journal of Low Power Electronics, Volume 2, Number 2, August 2006 , pp. 317-324(8)

Publisher: American Scientific Publishers

Abstract:

Two novel topologies of single-stage Super Class AB Operational Transconductance Amplifiers (OTAs) are presented. They are based on a novel technique to achieve a double current boosting: The differential input stage operates in Class AB by means of adaptive biasing techniques, and the active load provides additional dynamic current boosting using nonlinear current mirrors. The OTAs combine excellent performance with simplicity of design and suitability for low-voltage battery-powered applications. Experimental results for a test chip prototype fabricated in a standard 0.5-μm CMOS technology are presented, using a dual supply voltage of ±1-V and 10-μA bias currents. They confirm essential improvement of slew rate and gain-bandwidth product over a conventional Class A OTA with the same supply voltage and bias currents.

Keywords: LOW-POWER AND LOW-VOLTAGE CMOS CIRCUITS; OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA); ANALOG CMOS CIRCUITS; CLASS AB AMPLIFIERS; ADAPTIVE BIASING

Document Type: Conference report

DOI: http://dx.doi.org/10.1166/jolpe.2006.060

Publication date: 2006-08-01

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• The electronic systems that can operate with very low power are of great technological interest. The growing research activity in the field of low power electronics requires a forum for rapid dissemination of important results: Journal of Low Power Electronics (JOLPE) is that international forum which offers scientists and engineers timely, peer-reviewed research in this field.
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