Baseband phase modulator apparatus employing digital techniques

Details Baseband phase modulator apparatus employing digital techniques Baseband phase modulator apparatus employing digital techniques

1987-04-02

1988-08-02

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

370 20, H04L 2704

Patent

active

047617985

ABSTRACT:
There is disclosed a Zero IF modulator apparatus for modulating carrier signals with baseband signals, the modulator includes digital logic circuitry including a sine/cosine amplitude converter which is responsive to the baseband signals for providing first and second digital quadrature baseband signals. These digital quadrature baseband signals are then employed by coupling the same to digital-to-analog converters where the outputs of each converter is indicative of a first and second quadrature signal. These signals can then be translated to a given carrier signal for transmission over a desired communication channel.

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