Digital subharmonic sampling down-converter

Details Digital subharmonic sampling down-converter Digital subharmonic sampling down-converter

1989-04-10

1989-12-19

Laroche, Eugene R.

Demodulators

Frequency modulation demodulator

Input signal converted to and processed in pulse form

455205, H03D 300

Patent

active

048885576

ABSTRACT:
A digital subharmonic sampling converter, for use in an analog IF signal demodulator and the like, includes: an analog-to-digital converter (ADC) means receiving the IF analog signal for conversion to a digital data stream by sampling at a sampling rate frequency substantially equal to 4/(2n+1) times the IF signal frequency, where n is an integer greater than zero. A digital mixer means is used to convert the sampled data to baseband. The interleaved sequential in-phase I data words and quadrature-phase Q data words are then sorted into a pair of concurrent I and Q data word streams.

REFERENCES:
patent: 4647864 (1987-03-01), Rafferty et al.
patent: 4755761 (1988-07-01), Ray, Jr.

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