Acoustic filtering circuitry
US10917068B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2019 |
| Grant date | Feb 9, 2021 |
| Priority date | — |
| Expiry date | Mar 26, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/568
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Acoustic filtering circuitry includes an input node, an output node, a signal transmission path, a series acoustic resonator, and a shunt acoustic resonator. The signal transmission path is between the input node and the output node. The series acoustic resonator is coupled between the input node and the output node in the signal transmission path. Further, a temperature coefficient of frequency (TCF) of a parallel resonance frequency of the series acoustic resonator is positive. The shunt acoustic resonator is coupled between the signal transmission path and ground. Further, a TCF of a series resonance frequency of the shunt acoustic resonator is negative. By providing the TCF of the series acoustic resonator and the shunt acoustic resonator in this manner, self-heating of the acoustic filtering circuitry may be significantly reduced, thereby improving the performance of the acoustic filtering circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.