Adaptive tuning device and method utilizing a surface acoustic wave device for tuning a wireless communication device
US6570462B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2001 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Jun 3, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/1455
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An adaptive tuning method for a wireless communication device determines the impedance of a matching circuit relative to an impedance to be matched and adjusts the impedance of the matching circuit accordingly. A passive surface acoustic wave (SAW) device includes multiple terminated interdigital transducers (IDTs) which generate reflected SAWs when excited by incident SAWs, each reflected SAW having magnitude and phase characteristics dependent upon the particular IDT termination. According to the invention, the IDT terminations include the impedance matching circuit and the impedance to be matched. Input IDTs in the SAW device are excited with electrical signals, which are converted to generate the incident SAWs. The resultant reflected SAWs are converted by output IDTs into output electrical signal signals which can then be analyzed to determine magnitude and phase differences between the output electrical signal signals and generate an impedance matching circuit control signal based thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.