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. 13, 2004
Filed:
May. 20, 2002
Applicant:
Inventor:
Minoru Kozaki, Suwa, JP;
Assignee:
Seiko Epson Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B 1/00 ;
U.S. Cl.
CPC ...
H03B 1/00 ;
Abstract
The ring oscillator circuit is made by connecting K units of inverter circuits U , U , . . . , U K in a ring shape. The inverter circuit U comprises a CMOS inverter IV which includes MOS transistors MP and MN a P-channel MOS transistor MP which functions as the current source for a CMOS inverter IV an N-channel MOS transistor MN which functions as the current source for a CMOS inverter IV and a CMOS inverter IV which is connected in parallel to the CMOS inverter IV and includes MOS transistors MP and MN