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:
Jun. 07, 2011
Filed:
Feb. 01, 2010
Tetsuhiro Koyama, Kanagawa, JP;
Tetsuhiro Koyama, Kanagawa, JP;
Renesas Electronics Corporation, Kawasaki-shi, Kanagawa, JP;
Abstract
There is provided an analog-to-digital converter capable of performing analog-to-digital conversion with good accuracy. The analog-to-digital converter in accordance with the present invention includes a dither generation circuitwhich generates dither; an input polarity switching unitwhich switches a polarity of an input signal; an integrator; an integrator output regulator circuitwhich regulates an output voltage of the integrator; a window comparator; a control circuitwhich uses the comparison result of the window comparatorto control the input polarity switching unit, the integrator output regulator circuit, and the window comparatoras well as to generate a digital signal. The dither generation circuitgenerates dither in such a manner that a cycle in which the digital signal is read is an integral multiple of a dither cycle. Further, the dither generation circuitgenerates dither in such a manner that the number of times the count value is generated in the first half of one cycle of the dither is different from the number of times the count value is generated in the second half cycle thereof.