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. 09, 2008
Filed:
Nov. 17, 2006
Seeteck Tan, Singapore, SG;
Meng Chu, Zhangjiang Hi-tech Park, CN;
Xiaozhe Chen, Zhangjiang Hi-tech Park, CN;
Seeteck Tan, Singapore, SG;
Meng Chu, Zhangjiang Hi-tech Park, CN;
Xiaozhe Chen, Zhangjiang Hi-tech Park, CN;
O2Micro International Ltd., Georgetown, KY;
Abstract
A tunable band pass filter is provided. The tunable band pass filter includes a band pass filter and a plurality of switches coupled to the band pass filter. The band pass filter includes a plurality of transconductors and a plurality of capacitors. The tunable band pass filter can be configured as a complex band pass filter or as a tuning device for tuning the center frequency of the complex band pass filter depending on the operation of the plurality of switches. The tuning device includes at least one tuning integrator and a comparator. The tuning integrator includes at least one transconductor and a capacitor. The transconductor is selected via the plurality of switches from the plurality of transconductors and the capacitor is selected via the plurality of switches from said plurality of capacitors. The selected transconductor and the selected capacitor determinines the center frequency of the band pass filter.