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:
Sep. 28, 2004
Filed:
Jan. 23, 2003
Takao Nakashimo, Chiba, JP;
Atsuo Fukui, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
A reference voltage circuit is provided in which a difference of voltages applied to reference voltage circuits is reduced so that a difference of respective output voltages is made small. Depletion type MOS transistors ( ) are respectively connected in series with the drains of depletion type MOS transistors ( ) in two ED type reference voltage circuits. The gate of one of the series-connected depletion type MOS transistors ( ) is connected with the source of the other MOS transistor and the gate of the other MOS transistor is connected with the source of the one MOS transistor. Thus, a difference of voltages applied to the respective ED type reference voltage circuits is reduced so that a difference of respective output voltages is made small.