Lateral field excitation of bulk acoustic waves from an IC-compliant low voltage source
US7053523B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2004 |
| Grant date | May 30, 2006 |
| Priority date | — |
| Expiry date | Jun 5, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/17
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An Interdigital Bulk Acoustic-Wave Transducer (IBAT) device is provided with pairs of exciting electrode fingers disposed sufficiently close together on the piezoelectric substrate and dielectric coating over the exciting electrode fingers to generate an IC-compatible voltage at relatively high electric field strength, resulting in a reduced region of excitation and uniform electric field strength distribution. The IBAT advantageously produces a lateral electric field substantially uniform over a substantial portion of the active BAW structure area, reducing, or virtually eliminating sharp voltage spikes, an electrical field produced by the low voltages resident on integrated circuit (IC) chips, usually of a magnitude of 10 volts, or lower, the planar electrode structure being compatible with IC processing techniques, such as photolithography and the BAWs produced thereby being essentially plane waves, with propagation away from, but with phase progression substantially parallel to, the substrate surface. Numerous IBAT structural arrangements are possible by advantageously over-coating the IBAT electrode finger stripes with an insulating dielectric in different configurations, and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.