1999•IEE Proceedings - Circuits Devices and SystemsRequires access

Transconductance feedback amplifier configuration exhibiting bandwidth-independent voltage gain

B. Wilson

Abstract

Gain–bandwidth independence is potentially available in all dominant-pole single-loop feedback amplifier configurations except those in which the forward gain element type is identical to the overall amplifier configuration. In particular, feedback derived from a potential divider around a transconductance amplifier generates bandwidth-independent voltage gain along with optimum input loading conditions that can be attained practically with relatively few modifications to a standard 3-stage voltage operational amplifier architecture. Detailed simulation using a generic 741 operational amplifier circuit confirms the analytical predictions.

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Key concepts: Operational transconductance amplifier, Fully differential amplifier, Direct-coupled amplifier, Operational amplifier, Open-loop gain, Current-feedback operational amplifier, Common source, Transconductance