Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1992-04-03
1993-05-04
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330279, 455126, H03G 320
Patent
active
052085503
ABSTRACT:
In a radio-frequency power amplifier device, having a radio-frequency power amplifier for an input RF signal, part of the output signal of the amplifier is extracted, and the extracted voltage is compared with a reference voltage to apply a negative feedback to the gain control terminal of the power amplifier, thereby to stabilize the output power. The output power value is switched in accordance with a power level control signal. A variable attenuator or a variable-coupling-coefficient coupling means provided in front of the detector circuit switches the attenuation or the coupling coefficient depending on the power level, such that the magnitude of the input to the detector circuit is maintained at a constant level. The detector circuit therefore operates at the same operating point regardless of the switching of the power level, and the dynamic range required of the detector circuit may be narrow. The temperature variation of the output power at the time of low power output is small.
REFERENCES:
patent: 4307348 (1981-12-01), Nicholson
patent: 4476437 (1984-10-01), Fujiwara
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4709403 (1987-11-01), Kikuchi
patent: 5086508 (1992-02-01), Furuno
patent: 5117202 (1992-05-01), Tsuruoka
patent: 5126686 (1992-06-01), Tam
Mitsubishi Denki & Kabushiki Kaisha
Mullins James B.
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