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. 28, 2011
Filed:
Jan. 11, 2010
Kiyoshi Ishikawa, Kawasaki, JP;
Kiyoshi Ishikawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An analog-to-digital converter circuit includes: a capacitor array including a plurality of first capacitors, each having a first terminal connecting to a common node and having a capacitance represented by the nth power of 2 (2) on the basis of the smallest of the capacitances of the first capacitors=1; a second capacitor for contributing to attenuation of the voltage on the common node; a switch array, each switch of the switch array supplying and disconnecting one of a first reference voltage, a second reference voltage, and the voltage of an input signal to and from a second terminal of an associated one of the first capacitors; a second switch supplying and disconnecting a third reference voltage to and from the common node; a comparator comparing a voltage on the common node with the third reference voltage; and a control circuit controlling the first switches and the second switch.