Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1992-03-10
1993-01-26
Mullins, James B.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330129, 330136, 330279, 455126, H03F 132
Patent
active
051825244
ABSTRACT:
Phase and amplitude variations at the output of a high power pulsed microwave amplifier arising from instabilities of the driving electron beam are suppressed with a feed-forward system that can stabilize pulses which are too brief for regulation by conventional feedback techniques. Such variations tend to be similar during successive pulses. The variations are detected during each pulse by comparing the amplifier output with the low power input signal to obtain phase and amplitude error signals. This enables storage of phase and amplitude correction signals which are used to make compensating changes in the low power input signal during the following amplifier output pulse which suppress the variations. In the preferred form of the invention, successive increments of the correction signals for each pulse are stored in separate channels of a multi-channel storage. Sequential readout of the increments during the next pulse provides variable control voltages to a voltage controlled phase shifter and voltage controlled amplitude modulator in the amplifier input signal path.
REFERENCES:
patent: 5128629 (1992-07-01), Trinh
Martin Paul R.
Moss Kathleen S.
Mullins James B.
Ross Pepi
The Regents of the University of Calif.
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