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:
Oct. 05, 2010
Filed:
Nov. 09, 2005
Yoshimitsu Tanaka, Kanagawa, JP;
Yoshimitsu Tanaka, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An object of the present invention is to eliminate fluctuation in the value of the constant current I even if there is characteristic fluctuation in field effect transistors and at the same time, to improve the power consumption. There are provided with a plurality of current mirror circuits consisting of those on the reference side and on the mirror side; current holding capacitorsandprovided on the respective mirror sides of the plurality of current mirror circuits; sequential selection meansandfor selecting the plurality of current mirror circuits sequentially by a constant period; first switching meansandfor connecting respective reference sides and mirror sides of the plurality of current mirror circuits; reference voltage change-over meansandfor changing over reference voltages of constant current generation unitsandsuch that currents on the mirror sides become constant in conformity with the selection period of the plurality of current mirror circuits; and second switching meansandfor connecting the constant current generation unitsandto the reference sides of the plurality of current mirror circuits in conformity with the selection period.