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:
May. 26, 2020
Filed:
Jul. 27, 2018
Cindy X. Qiu, Brossard, CA;
Ishiang Shih, Brossard, CA;
Chunong Qiu, Brossard, CA;
Julia Qiu, Brossard, CA;
Andy Shih, Brossard, CA;
Yi-chi Shih, Los Angeles, CA (US);
Cindy X. Qiu, Brossard, CA;
Ishiang Shih, Brossard, CA;
Chunong Qiu, Brossard, CA;
Julia Qiu, Brossard, CA;
Andy Shih, Brossard, CA;
Yi-Chi Shih, Los Angeles, CA (US);
Other;
Abstract
Due to strong needs to reduce the dimensions and the cost of the RF filters and to reduce the number of filters required in an mobile handsets and wireless system covering numbers of operation bands, tunable RF filters which can cover as many bands or frequency ranges as possible are needed so that the number of filters can be reduced in the mobile handsets and wireless systems. The present invention provides tunable surface acoustic wave (SAW) IDT structures with the resonant frequency of the acoustic wave to be excited and to be transmitted tuned by digital to analog converters (DACs). The DAC converts an input digital signal to an output DC voltage and provide DC bias voltages to the SAW IDTs through integrated thin film biasing resistors. The polarity and the value of the output DC voltage are controlled by the input digital signal to achieve selection and tuning of the resonant frequency of the SAW IDTs.