Combined phase and frequency modulator for modulating an informa

Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal

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332 21, 332 22, 332 23R, 455112, 455113, H03C 309, H03C 340

Patent

active

047392886

ABSTRACT:
A combined phase and frequency modulation device for modulating a data signal in order to generate a plurality of narrow band signals for a communication system is disclosed, characterized by a direct synthesis phase locked loop for generating an output data signal having a selected frequency, a signal divider and phase modulator circuit, and a frequency multiplier for multiplying a modulated signal to produce an output having a desired frequency. The signal divider and phase modulator circuit includes a frequency divider which produces two quadrature related signals from the output data signal. A modulator connected with the frequency divider generates a suppressed carrier double sideband signal from one of the quadrature related signals. A summing device connected with the frequency divider and with the modulator combines the carrier signal with the other quadrature related signal to produce the modulated output signal which is multiplied by the frequency multiplier.

REFERENCES:
patent: 4068198 (1978-01-01), Otto
patent: 4114110 (1978-09-01), Nossen
patent: 4481489 (1984-11-01), Kurby

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