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. 17, 2004
Filed:
Jan. 22, 2001
Masuo Akamatsu, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An air meter is provided which enables the improvement of accuracy of internal reference voltages with few IC terminals. A band gap reference power supply circuit supplies an internal reference voltage to a characteristic adjusting circuit and an internal reference voltage VINT to a multiplier circuit . the band gap reference power supply circuit comprises a temperature current generating circuit for generating a current proportional to a temperature, a current mirror circuit for duplicating the current of the temperature current generating circuit , a reference voltage generating circuit through which the current duplicated by the current mirror circuit is caused to be flowed to generate the internal reference voltage ES, and a reference voltage generating circuit through which the current duplicated by the current mirror circuit is caused to be flowed to generate the internal reference voltage VINT.