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:
Jan. 27, 1987
Filed:
Nov. 13, 1984
Wolfdietrich G Kasperkovitz, Eindhoven, NL;
Herman W Van Rumpt, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A frequency doubling circuit for doubling the fundamental frequency of a signal wave, comprising a pair of full-wave rectifier circuits which produce output signals which are subtracted to derive the second harmonic of the fundamental frequency. The direct current component and unwanted harmonics produced by the rectifier circuits are suppressed by capacitive loading which establishes a phase-quadrature relationship between the fundamental signal waves applied to both rectifier circuits, and adaptively maintaining the amplitudes of the fundamental frequency signals produced thereby equal by means of a negative feedback gain control loop.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile