Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1991-10-21
1993-03-23
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330279, 375 60, 375 71, 455 89, 455126, 455127, H03G 320
Patent
active
051968061
ABSTRACT:
An output level control circuit for a high frequency power amplifier for amplifying high frequency signals having the "on" and "off" periods of transmit signals in a fixed recurrent cycle such as in a TDMA radio communication system or a GSM system. The high frequency detecting circuit for the output level control circuit is responsive to part of the output of the high frequency power amplifier and a control signal corresponding to said "on" and "off" periods of transmission power for generating an output level control signal for the high frequency power amplifier. The high frequency detecting circuit has detecting means for detecting the wave height of the high frequency signals and differential voltage generating means for generating, for each of said recurrent cycles, a differential voltage between the detection output during the "on" period and the detection output during the "off" period immediately preceding it. This differential voltage is used as the temperature-compensated output level control signal for the high frequency power amplifier.
REFERENCES:
patent: 4066965 (1978-01-01), Schultz et al.
Mullins James B.
NEC Corporation
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