Fast startup, micro power, low noise piezoelectric amplifier with extended low frequency response
US9269886B1 · kind B1 · utility
1Cited by
3References
22Claims
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Key dates
| Filing date | Oct 18, 2013 |
| Grant date | Feb 23, 2016 |
| Priority date | — |
| Expiry date | Nov 27, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45475
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit combines the features of fast startup with low current, low frequency response, and low noise. With the use of a novel biasing technique, it is possible to operate the piezoelectric crystal at zero DC voltage bias, both throughout the startup phase and during normal operation, by setting both ends of the piezoelectric crystal to the same voltage potential. In this application, the potential is that of the reference voltage. Not having to charge the piezoelectric crystal capacitance reduces the startup time dramatically.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.