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:
Sep. 23, 2003
Filed:
Aug. 16, 2001
Katsuhisa Daio, Kagoshima, JP;
Sony Corporation, Tokyo, JP;
Abstract
An asymmetry detection circuit having a simple circuit configuration capable of realizing reliable detection without dependence on the signal level and capable of realizing high precision asymmetry detection almost completely free of any influence from a voltage offset or the like, and a detection method of same, wherein a capacitor cuts off the direct current component of an input signal and passes the alternating current component, a bias voltage is added to the alternating current component in accordance with a constant voltage of a constant voltage source to generate an APL clamp signal, a comparator compares the signal with a constant voltage and outputs a pulse voltage signal representing a duty ratio of the signal in the APL value, a voltage/current conversion circuit outputs a current signal to charge or discharge a capacitor to generate an integrated signal, and a filter eliminates the alternating current component of the integrated signal and outputs the direct current component as an asymmetry detection signal.