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Title: Method and apparatus for stabilizing pulsed microwave amplifiers

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.
Inventors:
 [1]
  1. (Sacramento, CA)
Issue Date:
OSTI Identifier:
868645
Assignee:
Regents of University of Calif. (Oakland, CA) LBNL
Patent Number(s):
US 5182524
Contract Number:
AC03-76SF00098
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; stabilizing; pulsed; microwave; amplifiers; phase; amplitude; variations; output; power; amplifier; arising; instabilities; driving; electron; beam; suppressed; feed-forward; stabilize; pulses; brief; regulation; conventional; feedback; techniques; tend; similar; successive; detected; pulse; comparing; input; signal; obtain; error; signals; enables; storage; correction; compensating; changes; following; suppress; preferred; form; increments; stored; separate; channels; multi-channel; sequential; readout; provides; variable; control; voltages; voltage; controlled; shifter; modulator; path; power pulsed; power pulse; control voltage; controlled phase; pulsed microwave; power input; phase shift; output pulse; electron beam; input signal; error signal; preferred form; phase shifter; microwave amplifier; amplifier output; voltage controlled; provides variable; signal path; successive pulses; voltage control; error signals; amplitude modulator; separate channel; variable control; enables storage; amplitude correction; controlled ph; /330/455/