PLL stabilized frequency modulator with extended low frequency r

Details PLL stabilized frequency modulator with extended low frequency r PLL stabilized frequency modulator with extended low frequency r

1986-03-04

1987-11-17

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 23, 455113, 455119, H03C 309

Patent

active

047076704

ABSTRACT:
A modulator including a voltage controlled oscillator (VCO) having its center frequency stabilized to a reference frequency using a phase locked loop in which the low frequency range is increased by using frequency translation techniques. The VCO output signal is translated relative to the phase locked loop feedback signal so that an increased frequency division ratio can be used in the feedback loop and the effective frequency deviation at the phase comparator can be reduced by an arbitrary factor. This has the effect of increasing the allowable deviation at a given information signal frequency by that arbitrary factor. Likewise, a given deviation can be maintained for input information frequencies which are an arbitrary fraction of the low end cutoff frequencies of conventional modulators.

REFERENCES:
patent: 4313209 (1982-01-01), Drucker
patent: 4360788 (1982-11-01), Erps et al.

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