Microwave power amplifiers

Details Microwave power amplifiers Microwave power amplifiers

1992-07-10

1993-09-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330286, H03F 319

Patent

active

052433013

ABSTRACT:
A microwave power amplifier having application in multiple beam phased antenna array systems including a biasing means connection to the base of a microwave transistor being responsive to radio frequency signals applied to the amplifier to automatically adjust the transistor bias level to maintain constant amplifier gain. The biasing means includes two voltage regulators with their outputs capacitively coupled via a fixed resistor having a value determined by the characteristics of the transistor, the base of the transistor being connected to the biasing means at the junction of the resistor and the capacitive coupling of one of the regulators. The mode of operation of the power amplifier gives rise to a highly efficient linear system while under effective Class B (non-linear) bias.

REFERENCES:
patent: 3513406 (1970-05-01), Leuthauser
patent: 3525050 (1970-08-01), Wolf et al.
patent: 3708756 (1973-02-01), Fajen
patent: 3984783 (1976-10-01), Bickley
patent: 4387346 (1983-06-01), Fackler

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