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:
Mar. 15, 2011
Filed:
Mar. 28, 2008
Masahiro Kudo, Kawasaki, JP;
Masahiro Kudo, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A control circuit Ucomprises four PMOS transistors MP-MPand receives a voltage Vn and a voltage Vss. MPand MP, and, MPand MPare respectively connected in series between power supply Vdd and a fixed voltage Vss. Gate terminal of MPis connected to Vss. Reference current and its copy current Frespectively flow through NMOS transistors Mand M, of which respective source terminals are connected to Vss. Gate width of Mis a quarter of that of M. Drain terminal is connected to the gate terminals of MPand MP. Node between source terminal of MPand drain terminal of MPis connected to gate terminal of MP, and node between source terminal of MPand drain terminal of MPis connected to gate terminal of MP. The control circuit Ucontrols gate terminal voltage of Mto make an overdrive voltage of Mbecomes Vn.