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:
Jul. 26, 2011
Filed:
Apr. 17, 2007
Chih-hung Lin, Tainan County, TW;
Chin-fu LI, Puyan Township, TW;
Chia-jen Yu, Taipei County, TW;
Jiunn-tsair Chen, Hsinchu, TW;
Chih-Hung Lin, Tainan County, TW;
Chin-Fu Li, Puyan Township, TW;
Chia-Jen Yu, Taipei County, TW;
Jiunn-Tsair Chen, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
An echo cancellation circuit for an RFID reader and the method thereof are provided. The echo cancellation circuit includes a gain calculator, a gain adjustment circuit, and a subtraction circuit. The gain calculator provides a complex gain value according to a carrier signal and a received signal through an adaptive algorithm. The gain adjustment circuit is coupled to the gain calculator. The gain adjustment circuit multiplies the carrier signal by the complex gain value, and outputs the result of the multiplication. The subtraction circuit is coupled to the gain adjustment circuit. The subtraction circuit subtracts the output of the gain adjustment circuit from the received signal, and then provides the result of the subtraction as the output signal of the echo cancellation circuit.