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. 30, 2007
Filed:
Apr. 20, 2005
Chao-cheng Lee, Hsinchu, TW;
An-ming Lee, Hsinchu, TW;
Chao-Cheng Lee, Hsinchu, TW;
An-Ming Lee, Hsinchu, TW;
Realtek Semiconductor Corp., Hsinchu, TW;
Abstract
The present invention discloses an impedance matching circuit with automatic adjustment and a method thereof. The impedance matching circuit comprises: a resistor, for receiving a reference voltage and generating a reference current; a detection unit, for detecting resistance variation and generating a plurality of comparison voltages according to said reference current; a comparison unit, for comparing said reference voltage with said comparison voltages, and generating a control signal; and a composite resistor unit, for receiving said control signal and generating a matched impedance. Therefore, a matched impedance value can be obtained within a designed range in despite of the manufacturing process and the operation environment.