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. 16, 2019
Filed:
Oct. 31, 2016
Avago Technologies General Ip (Singapore) Pte. Ltd., Singapore, SG;
Paul Bradley, Los Altos, CA (US);
Avago Technologies International Sales Pte. Limited, Singapore, SG;
Abstract
A tunable BAW filter device operating in an allocated channel of a predetermined frequency band includes a voltage source and multiple BAW resonators. The voltage source selectively provides non-zero DC bias voltage based on a location of the allocated channel within the frequency band. Each BAW resonator has a resonance frequency, and includes a bottom electrode, a piezoelectric layer and a top electrode disposed over the piezoelectric layer, the top electrode being electrically connected to the voltage source via a resistor. The voltage source is activated, applying the non-zero DC bias voltage to the top electrode of each BAW resonator, when the location of the allocated channel is near an upper or lower corner of the frequency band. The resonance frequency of each BAW resonator is shifted in response to the non-zero DC bias voltage toward a center of the frequency band, improving insertion loss of the BAW filter device.