Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1991-08-26
1992-10-27
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330138, 330279, 375 71, 455126, 455127, H03G 320
Patent
active
051592835
ABSTRACT:
The power amplifier in accordance with the invention is responsive to a power level control signal so as to amplify radio frequency signals to define any one of a plurality of amplifier output power envelopes. The power amplifier comprises means for generating a predetermined time varying signal which represents a predetermined one of the plurality of amplifier output power envelopes, means for modifying the time varying signal in response to the power level control signal for definition of a selected output power envelope and control means for controlling the amplifier output power in response to the modified time varying signal to amplify the radio frequency signal according to the selected one of said plurality of output power envelopes. The time varying signal may be a sequence of values stored in memory. The modifying means may be a clipper which clips the time varying signal at a value that depends on the power level control signal or a multiplier that multiplies the time varying signal by a value that depends on the power level control signal or a subtractor that subtracts a value from the time varying signal which depends on the power level control signal.
REFERENCES:
patent: 4322689 (1982-03-01), Schucht
patent: 4592073 (1986-05-01), Watanabe
patent: 4992753 (1991-02-01), Jenson et al.
Bolvin Kenneth W.
Motorola Inc.
Mullins James B.
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