Circuit including a DC-FM phase locked loop

Details Circuit including a DC-FM phase locked loop Circuit including a DC-FM phase locked loop

1986-09-17

1987-07-21

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 23, 455113, H03C 306

Patent

active

046821244

ABSTRACT:
The invention provides a DC-FM phase locked loop for use in transmitters for measuring and control purposes, wherein the modulation signal controls, via an A/D converter, the output frequency of a frequency synthesizer, this output frequency being used as the reference for the phase comparator. This permits modulation with extremely low frequencies or DC without the necessity to interrupt the loop.

REFERENCES:
patent: 4286237 (1981-08-01), James
patent: 4313209 (1982-01-01), Drucker
patent: 4610030 (1986-09-01), Dominguez et al.

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