The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 1984
Filed:
Jun. 23, 1981
Applicant:
Inventors:
Robert Boudault, Limours, FR;
Gerard Pouzoullic, Gif sur Yvette, FR;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03D / ;
U.S. Cl.
CPC ...
329107 ; 329126 ; 329145 ; 375 94 ;
Abstract
A frequency demodulator including an 'exclusive-OR' circuit receiving two square-wave signals having a frequency corresponding to a frequency-modulated signal, and a delay circuit for delaying one of the square-wave signals before application to the 'exclusive-OR' circuit, by a delay varying versus frequency in such a way that the absolute value of the phase difference between the square-wave signals varies at most from 0.degree. to 180.degree. inversely with respect to changes in frequency. The output signal of the demodulator is supplied by a low-pass filter connected to the output of the 'exclusive-OR' circuit.