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. 09, 2011
Filed:
Dec. 12, 2007
Makoto Mizuki, Kyoto, JP;
Kazuyoshi Nishi, Kyoto, JP;
Tetsuro Ohmori, Osaka, JP;
Tomokazu Kojima, Osaka, JP;
Hiroshi Kojima, Kyoto, JP;
Makoto Mizuki, Kyoto, JP;
Kazuyoshi Nishi, Kyoto, JP;
Tetsuro Ohmori, Osaka, JP;
Tomokazu Kojima, Osaka, JP;
Hiroshi Kojima, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A current driving device comprises: a voltage supply part; a current supply part; and a plurality of current output parts, each comprising a current-voltage converting function, a voltage-current converting function, and a voltage holding capacitance element. The current output part takes three operation modes. Under a voltage supply mode, the current output part receives a voltage from the voltage supply part and holds the voltage in the voltage holding capacitance element. Under a current supply mode, the current output part receives the current from the current supply part, generates a second voltage by the current-voltage converting function and holds the voltage in the voltage holding capacitance element. Under a current output part, the current output part outputs an output current according to the voltage held in the voltage holding capacitance element by the voltage-current converting function. By charging the current output part with the reference voltage before the calibration performed by using the reference current, calibration of the current output part is performed at a high speed.