Active bias for a pulsed power amplifier

Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement

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Details

330289, 330295, H03F 130, H03F 368

Patent

active

054519071

ABSTRACT:
A high-power radio-frequency amplifier act on periodic pulses of RF energy. The bias is controlled for each of a bank of FETs or other amplifier devices that constitutes the main power stage. A sample of bias current is obtained during a blanking period on the front porch of the RF gating period. Quiescent drain current is measured, and stored on a sample/hold circuit. A digital signal processor provides bias values that are sent via a D/A converter to biasing circuits that add the bias levels to the input RF signal. If the bias current is above or below a desired level, the stored bias level is decreased or incremented respectively. A timing control circuit gates the sample/hold circuit and switches in advance of the biasing circuits. The timing control circuit also creates a blanking signal to apply to an attenuator to produce a null region during the first 100 microseconds of the gating signal. A thermal sensor is coupled to one or more amplifying devices for presetting the operating voltage when operation has been interrupted for a predetermined period of time.

REFERENCES:
patent: 3497822 (1970-02-01), Beurrier
patent: 3757241 (1973-09-01), Kime et al.
patent: 4458213 (1984-07-01), Quan
patent: 4459553 (1984-07-01), Diller
patent: 4476441 (1984-10-01), Gulczynski
patent: 4644293 (1987-02-01), Kennett
patent: 4794343 (1988-12-01), Yang
patent: 4829263 (1989-05-01), Gulczynski
patent: 4924191 (1990-05-01), Erb et al.
patent: 4933643 (1990-06-01), Jandu et al.
patent: 4959964 (1990-10-01), Jorgensen
patent: 5034700 (1991-07-01), Herrmann et al.
patent: 5060294 (1991-10-01), Schwent et al.
patent: 5101173 (1992-03-01), DiPiazza et al.
patent: 5128629 (1992-07-01), Trinh
patent: 5136257 (1992-08-01), Reading

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