Signal demodulator using a multiplying digital-to-analog convert

Details Signal demodulator using a multiplying digital-to-analog convert Signal demodulator using a multiplying digital-to-analog convert

1985-08-26

1986-09-09

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 375 80, 455337, H03D 306

Patent

active

046111778

ABSTRACT:
By using a multiplying digital-to-analog converter for signal demodulation in the disclosed detection scheme, the demodulating signal from the local oscillator can be in digital form without seriously affecting the detected, or demodulated, output. Specifically, a multiplying digital-to-analog converter (DAC) is used for detection. The multiplying DAC accepts an analog input for demodulation or detection and a signal in the form of a repeating string of digital values as the demodulating input. Sensitive, and therefore inherently unstable, filters generally required in the prior art to prefilter the demodulating signal to reduce undesirable higher harmonics are therefore not required, thus reducing one major source of instability in a detection system.

REFERENCES:
patent: 3947777 (1976-03-01), Burger
patent: 4433300 (1984-02-01), Ingle

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