Serrodyne modulator

Details Serrodyne modulator Serrodyne modulator

1990-12-21

1991-11-05

Pascal, Robert J.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332104, H04L 2700

Patent

active

050633619

ABSTRACT:
A direct digital synthesizer (DDS) includes a phase accumulator which generates phase words periodically and means for changing the phase of an RF signal. In a preferred embodiment, a DDS includes a pair of phase shifter channels having inputs and outputs coupled in parallel by make before break RF switches. The use of the dual phase shifter channels and make before break RF switches provides relatively smooth phase advance while eliminating fly-back transitions. This arrangement reduces excessive noise power in the output signal.

REFERENCES:
patent: 4873500 (1989-10-01), Genrich

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