Frequency modulator including frequency synthesizer

Details Frequency modulator including frequency synthesizer Frequency modulator including frequency synthesizer

1981-09-08

1983-12-20

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 19, 455112, H03C 300

Patent

active

044220537

ABSTRACT:
A synthesizer is disclosed having a frequency modulation phase-locked loop incorporating a voltage controlled oscillator (VCO) producing a 100 MHz, say, carrier which can be frequency-modulated. The VCO output is combined in a mixer with the output of another VCO which is variable stepwise. A frequency divider with a division factor of, say, 10, can be selectively interposed in the output of the VCO by means of a switch, and the resultant divided output is summed with a fixed frequency of, say, 90 MHz so as bring the output back to the 100 MHz carrier frequency. In this way, not only is the FM reduced by a factor of 10 (in this example) but so is the noise.

REFERENCES:
patent: 2114333 (1938-04-01), Conklin
patent: 2813977 (1957-11-01), Carter
patent: 3334300 (1967-08-01), Pischke et al.

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