Phase-locked loop frequency shift key modulator

Details Phase-locked loop frequency shift key modulator Phase-locked loop frequency shift key modulator

1976-12-23

1978-01-10

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325163, 325184, 331 25, H03C 300, H04L 2712

Patent

active

040681980

ABSTRACT:
MSK modulating apparatus employing a phase-locked loop. The loop includes a programmable divider which divides the output frequency of the voltage controlled oscillator by a relatively high value if binary 1 information is to be transmitted and by a relatively low value if binary 0 information is to be transmitted. The output of the voltage controlled oscillator is also divided by an output divider to obtain the desired carrier frequency and then filtered to provide a sinusoidal output signal. The resulting output signal varies by a differential frequency above or below a carrier center frequency when transmitting binary 1 or binary 0 data, respectively.

REFERENCES:
patent: 3551826 (1970-12-01), Sepe
patent: 3805192 (1974-04-01), Ocnaschek et al.
patent: 3997855 (1976-12-01), Nash

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