High efficiency amplifier

Details High efficiency amplifier High efficiency amplifier

1988-11-30

1990-01-30

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

H03F 330

Patent

active

048976156

ABSTRACT:
Amplifiers operating in push-pull are implemented to obviate input baluns and output signal combiners and their attendant losses. Amplifiers having two signal branches that each receive the input signal and have their signal branch outputs connected directly together. Each branch operates during alternate half cycles of the input signal while direct combining of the branch signal outputs produces a composite signal corresponding to the complete input signal. Each branch includes a matching input circuit and a heterojunction bipolar transistor whcih may be configured in either common collector or common emitter arrangement. The transistors are different since one is an NPN while the other is a PNP but they are selected to have similar direct current and radio frequency characteristics.

REFERENCES:
patent: 3495183 (1970-02-01), Doundoulakis et al.
patent: 3699465 (1972-10-01), Pranke
patent: 3784932 (1974-01-01), Wisherd
Donahue et al., "Part II: Putting the Overlay to Work at High Frequencies", Electronics, Aug. 23, 1965, pp. 78-81.
"Pulsed Power Transistor: 1 np at 1 GHz", Microwave Journal, vol. 22, No. 6, Jun. 1979, p. 34.
B. S. Yarman et al., IEEE Transactions on Microwave Theory and Techniques, pp. 2216-2222, Dec. 1982.
D. A. Sunderland et al., IEEE Transaction on Electron Devices, pp. 367-377, Feb. 1987.

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