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:
Aug. 27, 2002
Filed:
Sep. 22, 1999
Gilberto J. Hernandez, Miami, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A tunable filter ( ) includes first ( ) and second ( ) “bridged-T” resonators. The first ( ) and second ( ) resonators are capacitively coupled together via bandwidth control/coupling section ( ). A biasing section ( ) provides the proper biasing and decoupling for the filter ( ). Filter ( ) provides for low-side injection mode operation, and provides for a very deep zero on the lower side of the passband resulting in excellent selectivity. Filter ( ) provides for excellent selectivity while reducing the number of inductors and varactors needed in the filter circuit. A high side injection mode filter ( ) similar to filter ( ) is also described in the disclosure.