Digital phase-locked loop frequency modulator

Details Digital phase-locked loop frequency modulator Digital phase-locked loop frequency modulator

1976-12-23

1978-01-10

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325148, 325184, 331 25, H03C 300

Patent

active

040681998

ABSTRACT:
Frequency modulating apparatus employing a phase-locked loop. An analog signal is sampled periodically and each sample is converted to a digital signal by an analog-to-digital converter. A constant is added to the digital signal and the sum is employed as the divisor of a programmable divider connected in the phase-locked loop between the output of the voltage controlled oscillator and an input of a phase detector. The output of the voltage controlled oscillator is also divided by an output divider and then filtered to provide a sinusoidal output signal. The resulting output signal is at a center frequency which is frequency modulated by the analog signal.

REFERENCES:
patent: 3551826 (1970-12-01), Sepe
patent: 3805192 (1974-04-01), Ocnaschek et al.
patent: 3864637 (1975-02-01), Kanow

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