Phase locked loop frequency and phase modulators

Details Phase locked loop frequency and phase modulators Phase locked loop frequency and phase modulators

1984-05-03

1985-09-24

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 19, 332 23R, 455112, 455119, 331 23, H03C 309, H03L 718

Patent

active

045435421

ABSTRACT:
A signal generator is arranged to produce frequency or phase modulation at frequencies which extend from a high value down to zero, i.e. to a d.c. level shift. The output oscillator forms part of a phase locked loop which also includes a variable frequency divider. A modulation signal is applied to the loop, so that high frequency modulation signals directly modify the control signal which determines the frequency of the oscillator, and so that low frequency modulation signals alter the divisor value of the variable frequency divider so as to modify the frequency characteristics of the phase locked loop. Quantization noise is reduced by applying a masking signal to an analogue-to-digital converter which utilizes the low frequency modulation signals to alter the divisor value.

REFERENCES:
patent: 4308508 (1981-12-01), Sommer et al.

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