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:
May. 17, 2016
Filed:
Mar. 18, 2015
Casio Computer Co., Ltd., Tokyo, JP;
Goro Sakata, Hamura, JP;
CASIO COMPUTER CO., LTD., Tokyo, JP;
Abstract
In the present embodiment, quantizer output values including variation values corresponding to duty errors of pulse width data (PWM output signals) occurring by the difference of the pull-down/pull-up drive characteristics (drive capabilities) of a buffer are stored in advance in a feedback value memory in a quantizer as feedback values FBVto FBV, and a feedback value FBVn read out from the feedback value memory in response to the quantization of a delta-sigma modulation output is inputted into a subtractor by return input. Then, a quantizer output value including a variation value corresponding to a duty error is subtracted from input data Din, and delta-sigma modulation is performed such that the difference is minimized, whereby the duty error of pulse width data (PWM output signal) is compensated.