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:
Jan. 10, 1995
Filed:
Jun. 16, 1993
Masanori Inamori, Tenri, JP;
Toshihide Miyake, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
There are provided a first constant-current circuit and a second constant-current circuit, and a first resistor connected in series with the first constant-current circuit generates a band-gap voltage. The first constant-current circuit and the second constant-current circuit constitute a current Miller circuit, and a part of a current that flows through the second resistor connected in series with the second constant-current circuit is outputted as a constant current source. The constant-current power supply IC, which has the above-mentioned arrangement, is designed as follows: the first resistor and the second resistor have a predetermined line-width ratio that is determined in such a manner that if the respective line-widths vary by virtually the same value, a varied amount in the second constant current value that has been caused by a variation in the value of resistivity of the first resistor is cancelled by a varied amount caused by a variation in the value of resistivity of the second resistor. This arrangement is effective in compensating function and makes it possible to minimize the error on the constant current output due to deviations that occur during production.