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:
Nov. 23, 2004
Filed:
Jun. 06, 2002
Applicant:
Inventor:
Masaaki Soda, Tokyo, JP;
Assignee:
NEC Electronics Corporation, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 5/00 ;
U.S. Cl.
CPC ...
H03L 5/00 ;
Abstract
A variable impedance circuit has an impedance block including a plurality of MOS transistors connected in parallel by switching and having impedances in accordance with powers of 2, the powers corresponding to the sequential orders of the MOS transistors arranged. A control unit controls ON or OFF of each of the MOS transistors to thereby select one of overall impedances of the MOS transistors. The step difference in the variable impedances is substantially a constant irrespective of the overall impedance selected.