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. 22, 2006
Filed:
Jun. 22, 2005
Hiroyuki Hagiwara, Gunma, JP;
Haruo Kobayashi, Gunma, JP;
Hao San, Gunma, JP;
Atsushi Wada, Gifu, JP;
Hiroyuki Hagiwara, Gunma, JP;
Haruo Kobayashi, Gunma, JP;
Hao San, Gunma, JP;
Atsushi Wada, Gifu, JP;
Semiconductor Technology Academic Research Center, Kanagawa, JP;
Abstract
A DA converter circuit is provided for use in a ΔΣ AD modulator. The DA converter circuit includes a DA converter of segment switched capacitor type. The DA converter includes an operational amplifier, capacitors as connected in parallel to each other to supply electric charges to the operational amplifier, an electrically charging switch for switching of electrically charging electric charges onto the respective capacitors or not, and an electrically discharging switch for switching or not electrically discharging electric charges from the respective capacitors or not. A switch device performs either one of the electrically charging, the electrically discharging, grounding, and polarity inversion onto the respective capacitors. A controller controls the electrically charging switch, the electrically discharging switch and the switch device to execute a process of second-order DWA algorithm for performing a second-order noise shaping of a non-linearity of the DA converter circuit.