Phase locked loop frequency modulator

Details Phase locked loop frequency modulator Phase locked loop frequency modulator

1980-03-04

1981-12-29

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 23, 332 19, 455 76, 455112, 455113, H03C 309, H03L 718

Patent

active

043085083

ABSTRACT:
A frequency modulator including a free-running oscillator which is frequency modulated and which is frequency stabilized by means of a reference oscillation by way of a phase control loop having a phase detector and a loop filter. In order to be able to process d.c. components with such a frequency modulator, given a keyed modulation signal, and without abandoning the limitation of the modulation spectrum, the modulation signal is supplied to a control input of the oscillator both by way of a modulation filter and by way of the phase control loop. For this purpose, the phase control loop includes, between the oscillator output and the phase detector, a frequency divider having a division ratio controlled by the modulation signal.

REFERENCES:
patent: 3587003 (1971-06-01), Chastagnier
patent: 3805192 (1974-04-01), Ocnaschek et al.

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