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. 24, 2009
Filed:
Sep. 27, 2007
Hiroyuki Horibata, Gifu, JP;
Hiroyuki Horibata, Gifu, JP;
Epson Imaging Devices Corporation, Nagano, JP;
Abstract
A D/A converter with reduced power consumption is offered by reducing an amount of electric charges that is charged and discharged as D/A conversion is performed. A terminal of each of four capacitors C, C, Cand Cis connected to a common node. The capacitors C, C, Cand Chave capacitances C, C, 2C and 4C, respectively. A selection circuit SEL is provided with selection transistors ST, ST, ST, ST, STand ST, and selects and outputs either a first reference electric potential Vor a second electric potential Vaccording to a value of each bit of the digital signals D, Dand D. Each of transfer transistors TT, TTand TTtransfers each of outputs of the selection circuit SEL to another terminal of corresponding each of the capacitors C, Cand C, respectively, in response to a start pulse STP. Each of reset transistors RT, RT, RTand RTconnects the terminal with the other terminal of corresponding each of the capacitors C, C, Cand C, and applies the first reference electric potential Vto both the terminal and the other terminal in response to a reset pulse RST.