Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1982-03-15
1984-10-09
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330 2, 330279, H03G 320
Patent
active
044764375
ABSTRACT:
A system for detecting an abnormal condition of a high frequency output signal in its power level, comprising: a variable gain power amplifier which receives a high frequency input signal and produces an amplified high frequency output signal; a negative feedback control loop connected to the power amplifier, for automatically setting the power level of the amplified high frequency output signal to a desired one of a plurality of predetermined power levels, the negative feedback control loop being so arranged as to produce a DC signal which is constant in its magnitude so far as the power level of the high frequency output signal is maintained at its set value whichever one is selected from the plurality of predetermined power levels, the gain of the power amplifier being controlled on the basis of the DC signal; and a comparator which compares the DC signal with a reference signal to judge as to whether the high frequency output signal is abnormal or not in its power level.
REFERENCES:
patent: 4109213 (1978-08-01), Holley et al.
patent: 4143331 (1979-03-01), Page
patent: 4185248 (1980-01-01), Namura et al.
Hitachi Denshi Kabushiki Kaisha
Mullins James B.
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