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:
Sep. 09, 2014
Filed:
Oct. 31, 2012
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Seiko Nakamoto, Tokyo, JP;
Junya Nakanishi, Tokyo, JP;
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Abstract
A digital-analog converter circuit includes sampling capacitive elements (N) of which one ends are to be electrically connected to and disconnected from input terminals (D, D, DN), to which digital signals are input, via a switch unit (SWu), an operational amplifier (), a switch () capable of electrically connecting and disconnecting the other ends of the sampling capacitive elements (N) and an inverting input terminal of the operational amplifier (), and a switch unit (SWu) that is disposed between nodes between the switch unit (SWu) and the sampling capacitive elements (N) and the output terminal of the operational amplifier () and capable of connecting and disconnecting them. An on-resistance value of a MOS transistor included in the switch () is set to be larger than an on-resistance value of a MOS transistor included in the switch unit (SWu).