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:
Dec. 06, 2011
Filed:
May. 26, 2008
Chien-nan Kuo, Pingtung County, TW;
Horng-yuan Shih, Taipei, TW;
Yi-hsin Pang, Kaohsiung County, TW;
Chien-Nan Kuo, Pingtung County, TW;
Horng-Yuan Shih, Taipei, TW;
Yi-Hsin Pang, Kaohsiung County, TW;
Industrial Technology Research Institute, Hsinchu, TW;
National Chiao Tung University, Hsinchu, TW;
Abstract
A front-end circuit with coherent tunable filters is provided. The circuit includes a first filter, an amplifier, and a second filter. The amplifier is coupled to the first filter, and the second filter is coupled to the amplifier. Furthermore, the amplifier is placed between the first and second filters. The first filter has a first tunable intermediate frequency, and is used to filter a received signal. The amplifier is used to amplify the output of the first filter. The second filter has a second tunable intermediate frequency, and is used to filter the output of the amplifier. The first and second intermediate frequencies have a coherent-tuning relation with each other.