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Patent No. US 04282490
Issue Date Aug 4, 1981
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Patent 04282490 - Pulse count type FM demodulator circuit > Summary

US Patent

Patent No. US 04282490

Published on Aug 4, 1981

Application No. 6/006243

Filed on Jan 24, 1979

Priority Date -

Inventor/Applicants

Kusakabe, Hiromi - Yokohama, JPX (2)

Abstract

Disclosed is a demodulator circuit which comprises a limiter circuit, a differentiation circuit, a monostable multivibrator circuit and an integration circuit. The differentiation circuit is composed of a delay circuit and a differential logic circuit. The differentiation circuit supplies the monostable multivibrator circuit with a trigger pulse whose pulse width is determined by the delay circuit. The monostable multivibrator circuit is formed of a differential circuit, having a current source at its output circuit. The current source tends to increase the output voltage of the monostable multivibrator circuit and a driving impedance for the integration circuit.

Classification

International: 2

;

National: 5

329/103

357/14;

329/128;

375/80;

455/214;

Field of Search 8

455/214

325/344;

325/349;

375/80;

329/103;

329/110;

329/126;

329/128;