Transconductance amplifier operable with bipolar input

Amplifiers – Wheatstone bridge with amplifier in at least one arm

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318679, 330297, 330311, 330263, H03F 326, G05F 100

Patent

active

045285144

ABSTRACT:
An amplifier for bidirectionally driving a motor includes circuitry for enabling the amplifier to operate with a bipolar input signal while employing a single power supply. The amplifier includes an input section which receives the bipolar input signal and provides a unipolar output voltage. The operational amplifier drives a bridge drive network to provide a drive current to output bridge transistor in one of two directions. The bridge network includes control circuitry for causing all of the transistors of the drive bridge to be operated in their active regions, thereby improving the power dissipation characteristics of the network. The output bridge transistors are also controlled to operate in their active regions. In addition, circuitry is included for providing negative feedback for the amplifier despite the fact that the output current is always a positive current.

REFERENCES:
patent: 4066945 (1978-01-01), Korte, Jr.
patent: 4146801 (1979-03-01), Vali et al.

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