Integrated FM detector including an oscillator having a capacito

Details Integrated FM detector including an oscillator having a capacito Integrated FM detector including an oscillator having a capacito

1993-03-10

1993-12-28

Grimm, Siegfried H.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Including borehole fluid investigation

375 82, 455214, 331111, H03D 300

Patent

active

052743381

ABSTRACT:
An FM detector for demodulating frequency modulated signals includes an FM detector having an oscillator composed of a capacitor and a Schmitt Trigger. The oscillator is controlled by the input signal to the FM detector. The FM detector also includes a phase detector for mixing the input signal with an oscillator signal from the oscillator to provide an output signal. The frequency of the oscillator is set to the frequency of the input signal using components internal to the FM detector. A first switch is used to charge and discharge the capacitor in accordance with the state of the Schmitt Trigger. A second switch is used to set the frequency of the oscillator to the frequency of the input signal.

REFERENCES:
patent: 3694772 (1972-09-01), Sordello
patent: 3869679 (1975-03-01), Grebene
patent: 4928068 (1990-05-01), Main
IEEE Transactions On Consumer Electronics Aug. 1988 vol. 34 No. 3 pp. 625 to 633, Yamamoto et al, "A New Audio Processor For EIAJ MTS".

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