Pulse counting FM demodulator

Details Pulse counting FM demodulator Pulse counting FM demodulator

1998-09-14

2000-05-16

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal converted to and processed in pulse form

329342, 455214, H03D 300, H03K 906

Patent

active

060642556

ABSTRACT:
A pulse counting FM demodulator includes a differentiating circuit that differentiates an FM intermediate-frequency signal to produce a differentiated pulse signal. A trigger signal is generated based on the differentiated pulse signal and is used to control the charging and discharging of a capacitor that is included in a monostable multivibrator. The charging and discharging of the capacitor provides an output level inverting operation. A variable current source supplies the capacitor with a charging current that is varied in response to an externally supplied control voltage, and an output circuit provides a demodulated output signal having a level corresponding to the output level inverting operation in the monostable multivibrator.

REFERENCES:
patent: 4282490 (1981-08-01), Kusakabe

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