Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1986-11-19
1987-12-15
LaRoche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330268, 330297, H03F 318, H03F 326
Patent
active
047136294
ABSTRACT:
The positive and negative outputs of an operational amplifier are employed to drive two oppositely phased current mirror circuits, which in turn drive oppositely phased power amplifier stages which drive the load directly without the use of an output transformer. Negative feedback is provided from the output to the operational amplifier to enhance flat response over the frequency range of interest. The oppositely phased power output stages are supplied by a power source which provides positive and negative supply voltages with reference to reference "ground". A plurality of capacitors are selectively connected as need be between the positive and negative voltage busses and ground to bypass spurious high frequency oscillations. A relatively high voltage output is achieved from the amplifier without exceeding the breakdown voltages of the transistors by employing a plurality of cascaded "Darlington" type circuits in the power amplifier.
REFERENCES:
patent: 3944944 (1979-03-01), Ellenbecker
patent: 4319199 (1982-03-01), Sunderland
patent: 4555672 (1985-11-01), Segal
"Circuit Ideas", Wireless World, Oct. 1981, p. 48.
LaRoche Eugene R.
McCutcheon Nathan
Sokolski Edward A.
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