Amplifiers – Wheatstone bridge with amplifier in at least one arm
Patent
1983-11-28
1985-07-09
Mullins, James B.
Amplifiers
Wheatstone bridge with amplifier in at least one arm
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.
Computer Memories, Incorporated
Mottola Steven J.
Mullins James B.
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