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:
Apr. 05, 2011
Filed:
Sep. 02, 2008
Andreia Cathelin, Laval, FR;
Stephane Razafimandimby, Granoble, FR;
Andreas Kaiser, Villeneuve d'Ascq, FR;
Andreia Cathelin, Laval, FR;
Stephane Razafimandimby, Granoble, FR;
Andreas Kaiser, Villeneuve d'Ascq, FR;
STMicroelectronics S.A., Montrouge, FR;
Centre National de la Recherche Scientifique, Paris, FR;
Abstract
A lattice tunable filtering circuit includes a first input and a second input, and a first output and a second output. The circuit includes two series branches and two parallel branches. The first and second series branches include a Tunable Resonator Component (TRC) which presents a first series resonance frequency whereas the third and fourth parallel branches present a second series resonance frequency which has a value being lower than that of the first series resonance frequency. The first and second series resonance frequencies are tunable by one analog control quantity. The filtering circuit further includes a feedback control loop for the control of the analog quantity, which feedback is based on a criterion of equality between the modulus of impedances Zs and Zp.