Phase modulator for phase shift key communications systems

Details Phase modulator for phase shift key communications systems Phase modulator for phase shift key communications systems

1975-04-25

1976-03-23

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325161, 332 30V, H03C 322, H04L 2720

Patent

active

039463370

ABSTRACT:
A carrier wave is directed through a voltage controlled phase shifter to a load. A sample of the signal at the output of the voltage controlled phase shifter is selectably applied, in accordance with modulation information, through one of a plurality of transmission line phase shifters to a phase detector which also receives a sample of the carrier wave. The resulting phase detector output signal is applied through a low pass filter to control the voltage controlled phase shifter.

REFERENCES:
patent: 2923891 (1960-02-01), Nicholson, Jr.
patent: 3454904 (1969-07-01), Clites et al.

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