Synchronized receiver power system

Details Synchronized receiver power system Synchronized receiver power system

1978-03-16

1980-02-12

Griffin, Robert L.

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

By dynamoelectric machine converter

363 77, H04B 116

Patent

active

041885856

ABSTRACT:
A portable radio receiver powered by a battery includes an RF amplifier, an IF amplifier and an audio amplifier powered by a first regulated, switched, DC power converter that derives a first DC voltage. A frequency synthesizer, including varactor diodes, is powered by a second regulated, switched DC power converter that derives a second DC voltage. Digital circuitry included in the synthesizer is powered by opposite polarity, third and fourth power converters. A synchronizing source for switching all of the power converters simultaneously has a fundamental and harmonics outside of the bandpasses of the audio and IF amplifiers to minimize the injection of spurious signals by the power converters into the amplifiers. The synchronizing source is FM modulated by an audio source so that harmonics of the synchronizing source are spread over a predetermined spectrum and the harmonics have noise-like characteristics spread over relatively wide frequency ranges.

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patent: 4030015 (1977-06-01), Herko et al.
patent: 4034232 (1977-07-01), La Venture

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