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:
Feb. 05, 2013
Filed:
Feb. 28, 2011
Kenta Aruga, Yokohama, JP;
Suguru Tachibana, Yokohama, JP;
Koji Okada, Yokohama, JP;
Fujitsu Semiconductor Limited, Yokohama, JP;
Abstract
An A/D converter includes a capacitive DAC configured to perform conversion of high-order bits by receiving a differential signal, a resistive DAC configured to perform conversion of low-order bits, a resistive correction DAC configured to operate to correct the capacitive DAC, and a comparator. The capacitive DAC includes a positive-side capacitive DAC and a negative-side capacitive DAC operating in a complementary fashion, and the comparator, which includes a plurality of differential circuits, is configured to compare output potentials of the positive-side capacitive DAC and the negative-side capacitive DAC. The positive-side capacitive DAC and the negative-side capacitive DAC include first capacitive elements each formed from interconnect layers excluding an uppermost interconnect layer, and the comparator includes second capacitive elements each provided between adjacent ones of the differential circuits and formed from interconnect layers including the uppermost interconnect layer.