Frequency demodulator with resampled output

Details Frequency demodulator with resampled output Frequency demodulator with resampled output

1997-12-09

1999-06-08

Mis, David

Demodulators

Frequency modulation demodulator

Input signal converted to and processed in pulse form

329343, 455214, 455337, H03D 300, H04B 116

Patent

active

059107529

ABSTRACT:
An receiver receives, amplifies, filters, and downconverts an RF signal to obtain an FM signal. The FM signal is then limited by a limiter and sampled by an ADC. The FM samples from the ADC are provided to an edge detector which detects transitions in the FM samples. The transitions correspond to zero crossings in the FM signal. The time period between the zero crossings, or the cycle width, is measured with a counter to determine the instantaneous frequency f.sub.c of the FM signal. The demodulated output is proportional to the instantaneous frequency which can be determined from the measured cycle periods as f.sub.c =1/2T.sub.c, f.sub.c .apprxeq.-.alpha.T.sub.c, or f.sub.c .varies.T.sub.c, where T.sub.c is the measured cycle period, and .alpha. is a constant based on the slope of 1/2T.sub.c,avg, where T.sub.c,avg is the average cycle period. The sample rate of the demodulated output can be reduced, through resampling, to minimize power consumption in the subsequent signal processing blocks.

REFERENCES:
patent: 4884037 (1989-11-01), Sogo
patent: 5239273 (1993-08-01), Hedstrom et al.

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