RF amplifier system having multiple selectable power output leve

Details RF amplifier system having multiple selectable power output leve RF amplifier system having multiple selectable power output leve

1989-08-15

1992-06-30

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330279, 455116, 455126, H03G 320

Patent

active

051266865

ABSTRACT:
A control circuit for a radio frequency (rf) amplifier having multiple selectable power output levels in response to a plurality of input control signals is presented. The rf amplifier includes a variable gain input which is responsive to the control circuit. The control circuit includes an attenuator coupled to the output of the rf amplifier for providing an attenuated rf signal and an detector coupled to the output of the attenuator for generating a DC output signal which is substantially linearly related to the magnitude of the rf signal output by the rf amplifier. The control circuit also includes a means coupled to the input control signals for selecting one of a plurality of amplification factors. An amplifier is used to amplify the DC output signal generated by the detector using the selected amplification factors. The amplified output is coupled to the variable gain input of the rf amplifier.

REFERENCES:
patent: 4057765 (1977-11-01), Schuermann
patent: 4147991 (1979-01-01), Ijichi et al.
patent: 4450413 (1984-05-01), Fujibayashi
patent: 4499430 (1985-02-01), Fujii
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4528519 (1985-07-01), Van Driest
patent: 4602218 (1986-07-01), Vilmur et al.

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