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:
Aug. 27, 2013
Filed:
Jul. 19, 2011
Kenta Aruga, Yokohama, JP;
Suguru Tachibana, Yokohama, JP;
Sanroku Tsukamoto, Kawasaki, JP;
Koji Okada, Kasugai, JP;
Kenta Aruga, Yokohama, JP;
Suguru Tachibana, Yokohama, JP;
Sanroku Tsukamoto, Kawasaki, JP;
Koji Okada, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Fujitsu Semiconductor Limited, Yokohama, JP;
Abstract
A successive approximation A/D converter, has a main DAC having a capacitive element group coupled to a top node and a switch group; a comparator comparing voltage of the top node with comparison reference voltage; a correction DAC generating correction voltage in accordance with a capacitance error of a capacitive element pair to be balanced in the main DAC, and supplying the correction voltage to the top node; and a control circuit generating internal digital input for controlling the switch group and a correction code for controlling the correction voltage, and outputting a successive approximation result by the comparator when the A/D conversion is performed. The control circuit measures a capacitance error of the capacitive element pair to be balanced, and determines an offset-removed capacitance error where an offset generated in the measurement is removed from the capacitance error.