Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1992-03-02
1993-09-14
Mottola, Steven
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330 85, 455115, H03G 320
Patent
active
052452972
ABSTRACT:
A power amplifier suitable for use in TDD and TDMA systems in which burst transmissions have to conform to a time mask, comprises a power amplifier (10) having a signal input (11), a signal output (14) and a control voltage input (24). A r.f.feedback control loop is coupled between the signal output (14) and the control voltage input (24). The control loop includes detection means (18) coupled to a comparison means (22) in which the detected signal is compared with reference pulses produced by a generating means (28). The output of the comparison means is coupled to the control voltage input (24). In order to provide a control signal when the output power level is too low to be detected, an artificial detector (38) is connected between the output of the comparison means (22) and its input for the detected signal in order to feed back the control voltage. As a result the control voltage versus power output characteristic is extended which leads to the generation of less transient sidebands and interference.
REFERENCES:
patent: 4392245 (1983-07-01), Mitama
patent: 5101175 (1992-03-01), Vaisanen
Claydon Martin
Griffiths Jonathan C.
Mottola Steven
Treacy David R.
U.S. Philips Corporation
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