RF amplifier bias control method and apparatus

Details RF amplifier bias control method and apparatus RF amplifier bias control method and apparatus

1992-07-02

1994-05-10

Mottola, Steven

Amplifiers

With control of power supply or bias voltage

330136, H03G 320

Patent

active

053111435

ABSTRACT:
A bias control circuit (200) for use with an RF amplifier (202) comprises a detector (R1) coupled to the RF amplifier (202) for detecting a DC current provided to the amplifier (202) from supply voltage (VCC). Thereafter, an adjustment circuit (206-210), coupled to the detector (R1) and the RF amplifier (202) adjusts the amplifier's bias voltage (V bias) as a function of the current draw in order to control the RF amplifier's quiescent operating point (bias current) and thereby optimize the RF amplifier's operation for selected operating performance characteristics like gain performance, intermodulation performance, and efficiency.

REFERENCES:
patent: 4158180 (1979-06-01), Challen
patent: 4547746 (1985-10-01), Erickson et al.
patent: 4760347 (1988-07-01), Li et al.
patent: 4821000 (1989-04-01), Imanishi
patent: 5043672 (1991-08-01), Youn
patent: 5196807 (1993-03-01), Fujisawa
patent: 5204637 (1993-04-01), Trinh

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