Phase modulator circuit for encoding two binary digits per cycle

Details Phase modulator circuit for encoding two binary digits per cycle Phase modulator circuit for encoding two binary digits per cycle

1990-06-21

1991-02-26

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

Including logic element

375 52, 375 67, H04L 2720, H03C 300

Patent

active

049965034

ABSTRACT:
A phase modulator circuit for encoding successive serial binary digits at the zero crossing points of a sine wave carrier. A digital one is encoded as a brief phase deviation of the carrier and a digital zero as the normal wave form. The carrier frequency is one-half the clock frequency of the encoded data. A digital processing circuit operating at one-half the clock frequency of the data controls one shot multivibrators which control electronic switches to deviate the carrier.

REFERENCES:
patent: 3394313 (1968-07-01), Ellis et al.
patent: 4937840 (1990-06-01), Hotine

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