Resonator temperature compensated time base and watch using said time base
US4537515A · kind A · utility
26Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1982 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Dec 6, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/028
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
To compensate for frequency variation in the quartz oscillator 4, 6 due to temperature variation, a second quartz oscillator 12, 14 forming a thermal sensor is employed. The beat frequency fB (circuit 16) which is counted in the counter 26 for a period of time T.sub.1 gives a measurement corresponding to temperature. The number which is thus counted is raised to its square and by means of the comparator 30 taken away from the pulses counted by the divider 8 with a periodicity T.sub.T. The system may be used to provide temperature compensation for a time keeping quartz time base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.