Failure monitor for crystal filters
US4284946A · kind A · utility
3Cited by
3References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1979 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Jun 18, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H3/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A comparator has one input terminal connected to a reference voltage terminal and a second input terminal connected to sense the voltage on the resonator structure of a crystal filter. In the event the voltage on the resonator structure changes, such as by failure of the ground connection, the comparator generates an output signal indicating crystal filter failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.