Apparatus for field testing the performance of a feedforward amp

Details Apparatus for field testing the performance of a feedforward amp Apparatus for field testing the performance of a feedforward amp

1985-12-23

1988-12-20

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

330 2, G01R 2700, G01R 1900, G01R 2100, G01R 2300

Patent

active

047927518

ABSTRACT:
An apparatus for field testing a feedforward amplifier includes a source of an RF signal and a source of an audio frequency signal. Both of these signals are applied to the feedforward amplifier under test. A failure in one of the active elements in the feedforward amplifier will increase the level of distortion and thus produce audio-frequency sidebands on the RF carrier at the output of the feedforward amplifier. These audio sidebands are detected in a double balanced mixer which also receives a phase-shifted RF test signal. The output of the double balanced mixer is representative of the level of amplifier distortion and thus of a failure in the feedforward amplifier.

REFERENCES:
patent: 2988693 (1961-06-01), Billig et al.
patent: 3038119 (1962-06-01), Billig et al.

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