Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1981-03-27
1983-09-06
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330265, 330276, H03F 330
Patent
active
044031980
ABSTRACT:
A biasing circuit for MOSFET power amplifiers in complementary pair push-pull single ended or bridge configuration. The biasing circuit includes a complementary pair of bi-polar transistors operating as common base amplifiers. Each amplifier includes emitter and collector resistances. A portion of the collector resistance of each common base amplifier acts as a gate-source biasing resistor for an associated MOSFET power transistor. The active feedback circuit is responsive to the voltage at a center tap of the primary winding of the amplifiers output transformer. The effect of the active feedback arrangement is to reduce the closed loop voltage gain of a conventional bridge amplifier from approximately 8.5 to approximately 0.9 thereby minimizing voltage fluctuations at the center tap of the primary of the output transformer.
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patent: 4163908 (1979-08-01), Price
patent: 4213098 (1980-07-01), Tsividis
General Electric Company
Mullins James B.
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