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:
Mar. 04, 2008
Filed:
Jul. 25, 2005
Chang Sheng-fuh, Hsinchu, TW;
Chen Wen-lin, Hsinchu, TW;
Shiu Yu-da, Hsinchu, TW;
Chen Hung-cheng, Hsinchu, TW;
Tang Shu-fen, Hsinchu, TW;
Chen Albert, Hsinchu, TW;
Chang Sheng-Fuh, Hsinchu, TW;
Chen Wen-Lin, Hsinchu, TW;
Shiu Yu-Da, Hsinchu, TW;
Chen Hung-Cheng, Hsinchu, TW;
Tang Shu-Fen, Hsinchu, TW;
Chen Albert, Hsinchu, TW;
Integrated System Solution Corp., Hsinchu, TW;
Other;
Abstract
The present invention discloses a dual-band active filter having filtering response and positive pass-band gain. The dual-band active filter includes an input match unit for gain match of the dual-band active filter and for having a band-pass filtering response; a first gain stage electrically connected to the first input match unit for providing the flat gain of the dual-band active filter; an inter-stage unit electrically connected to the first gain stage for matching gain and for having a band-stop filter response; a second gain stage electrically connected to the inter stage unit for providing the flat gain of the dual-band active filter; and an output unit electrically connected to the second gain stage for matching the dual-band active filter and for having a low-pass filtering response. The dual-band active filter according to the present invention uses the cascade connection of multiple filter stages to have band-pass filtering response at two different frequency bands and obtain high stop-band attenuation by providing plural transmission zeros in the stop-band.