Amplifiers – With semiconductor amplifying device – Including protection means
Patent
1984-04-09
1985-10-15
LaRoche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including protection means
330207P, 330279, 330129, H03G 320
Patent
active
045477469
ABSTRACT:
There is disclosed a power amplifier which is useful in broadband systems having load impedances with VSWRs up to a range of 2:1 or 2.5:1. The power amplifier is constructed to change its operating conditions to match the load as presented at the output of the amplifier and is particularly useful in systems employing frequency hopping requiring broadband construction. A feedback signal from the output of the amplifier is constructed to provide a signal representing the difference between forward and reflected power which is compared in a multiplier with a signal representing current flow in the power amplifier to produce a control voltage for adjusting the supply voltage of transistors forming the power amplifier. Thereafter, if the load impedance changes, the supply voltage is also changed to minimize dissipation and maintain the efficiency of the amplifier substantially constant.
REFERENCES:
patent: 3449680 (1969-06-01), Schilb et al.
patent: 3641451 (1972-02-01), Hollingsworth et al.
patent: 4165493 (1979-08-01), Harrington
patent: 4320350 (1982-03-01), Drapac
Erickson Alan R.
Heidt Marvin W.
Hamann H. Fredrick
LaRoche Eugene R.
Montanye George A.
Mottola Steven J.
Rockwell International Corporation
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