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:
Apr. 22, 2003
Filed:
Mar. 11, 2002
Applicant:
Inventors:
Horng-Der Chang, Hsinchu, TW;
Chao-Cheng Lee, Hsinchu, TW;
Assignee:
Realtek Semiconductor Corp., , TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 1/9003 ;
U.S. Cl.
CPC ...
H03K 1/9003 ;
Abstract
The present invention discloses an impedance matching circuit for facilitating impedance matching between the characteristic impedance of a cable and the input impedance at the input terminal of a receiver for data transmission comprising: a first transistor, a second transistor, a resistor, a negative feedback control circuit, a multiplexer and a reference voltage generator. When the characteristic impedance of the cable varies, the equivalent resistance of the impedance matching circuit can be kept equal to the resistance of the varied characteristic impedance of the cable by adjusting the reference voltage.