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:
Mar. 01, 2001
Minoru Takeda, Tokyo, JP;
Kazuyuki Fujiwara, Tokyo, JP;
Nippon Precision Circuits Inc., Tokyo, JP;
Abstract
In a delta sigma type D/A converter, in order to be capable of carrying out muting operation in steps at steps lower than 1 quantized step by digital processing, a multiplexor for selectively outputting a mute code for making an analog signal null and a thermometer code to a local DAC is provided between a thermometer code converter and the local DAC a time period of 1/M of a sampling period is made to constitute 1 cycle, at m1 (0≦m1≦M) cycle, the thermometer code is made an output of the multiplexor and at other m2 (m2=M−m1) cycle, the mute code is made an output thereof and muting is carried out reducing the m1 cycle or muting is relieved by increasing thereof in steps at respective sampling period.