Differential slope demodulator for low-IF frequencies

Details Differential slope demodulator for low-IF frequencies Differential slope demodulator for low-IF frequencies

2008-07-29

2008-07-29

Chang, Joseph (Department: 2817)

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

C329S315000, C329S340000

Reexamination Certificate

active

11399058

ABSTRACT:
A circuit and method for differential slope demodulator circuit are shown that utilize amplitude stabilizing of a frequency modulated signal to obtain an amplitude stabilized signal. Also shown is bandpass filtering of the amplitude stabilized signal for a first frequency that is offset by a shift frequency below an intermediate frequency, to obtain a first filtered signal and bandpass filtering the amplitude stabilized signal for a second frequency that is offset by the shift frequency above the intermediate frequency, to obtain a second filtered signal. The circuit and method further operate by detecting an envelope of the first filtered signal to obtain a first envelope signal, detecting an envelope of the second filtered signal to obtain a second envelope signal, and differencing the first and second envelope signals to obtain a demodulated output signal.

REFERENCES:
patent: 2379748 (1945-07-01), Roberts
patent: 2926316 (1960-02-01), Rae-Fraser
patent: 4193033 (1980-03-01), Voorman
patent: 5017841 (1991-05-01), Miura
patent: 5341107 (1994-08-01), Bijker et al.
Kennedy, “Electronic Communication Systems”, 1977, McGrow Hill, Second Edition, pp. 189-201.

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