Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1991-08-21
1993-05-04
Pascal, Robert J.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330279, 330136, H03G 320
Patent
active
052085490
ABSTRACT:
An automatic power control apparatus has a level control circuit for adjusting the power level of a linearly modulated signal prior to amplification by a power amplifier, and a coupler for extracting part of the amplified signal. An envelope detector detects the envelope of the extracted signal. A dc component detecting means detects the dc component of the envelope signal. An error amplifier amplifies the difference between this dc component and a reference voltage, and a loop filter filters the amplified difference to produce a control voltage that controls the level control circuit, thus controlling the power of the amplified signal without being affected by ac components of the signal envelope.
REFERENCES:
patent: 4574248 (1986-03-01), Snodgrass
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 4709403 (1987-11-01), Kikuchi
patent: 4996500 (1991-02-01), Larson et al.
patent: 5043672 (1991-08-01), Youn
Dinh Tan
Mitsubishi Denki & Kabushiki Kaisha
Pascal Robert J.
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