Tunable surface acoustic wave resonators and SAW filters with digital to analog converters
US10666227B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jul 27, 2018 |
| Grant date | May 26, 2020 |
| Priority date | — |
| Expiry date | Dec 7, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2009/02165
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.