Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1997-01-21
1998-11-24
Mottola, Steven
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330140, H03G 320
Patent
active
058413197
ABSTRACT:
An envelope level of an output of a variable gain power amplifier is detected by a detector. An envelope level of an output of the variable gain power amplifier detected by the detector and a waveform of a reference signal which is generated from a reference signal generator are compared. A gain of the variable gain power amplifier is controlled in accordance with a comparison output. Upon leading of a transmission output, the reference signal is raised from a grounding level to a rest value of the detector or more and is maintained at a value higher than the rest value of the detector. After the reference signal enters a response range of a negative feedback loop, it is smoothly raised along a cosine square wave. Upon trailing of the transmission output, the reference signal is smoothly reduced to a value near the rest value of the detector along a cosine square wave and is maintained at a value near the rest value of the detector. After the negative feedback loop does not respond, the reference signal is reduced to the rest value of the detector or less.
REFERENCES:
patent: 5214393 (1993-05-01), Aihara
patent: 5319804 (1994-06-01), Matsumoto et al.
patent: 5509011 (1996-04-01), Birth
T. Noguchi et al., "Modulation Techniques for Microwave Digital Radio", IEEE Communications Magazine, vol. 24, No. 10, pp. 21-30 (Oct. 1986).
Maioli Jay H.
Mottola Steven
Sony Corporation
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