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. 16, 2007
Filed:
Dec. 02, 2005
Yasuhiko Sekimoto, Hamamatsu, JP;
Yasuhiko Sekimoto, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A duty ratio correction circuit includes: a first switching amplifier circuit into which an input pulse signal is input; a current control device connected with the switching device for controlling a current in accordance with a bias voltage signal; a waveform shaping circuit that correct an output of the first switching amplifier circuit; a first integration circuit that integrates a corrected output; a reference voltage setting unit that sets a reference voltage signal defining a duty ratio; a comparator circuit that compares an output of the first integration circuit with the reference voltage signal; a second switching amplifier circuit that includes a switching device connected in series with a constant current circuit, the switching device using a comparison judgment signal as a gate signal; and a second integration circuit that integrates an output of the second switching amplifier circuit and outputs the bias voltage signal.