Closed loop temperature compensated frequency reference
US4513259A · kind A · utility
31Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1982 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Dec 23, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/026
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A closed loop frequency source includes a controllable oscillator that provides a first frequency source, a reference oscillator that provides a second signal, and a comparator that compares the two frequencies to provide an error signal that represents the difference between the frequencies. The error signal is used by an error signal generator to generate a compensation signal which offsets the carrier frequency that drives an output device such as a time-of-day clock so that the output device automatically gains or loses the previously accumulated time error without the necessity of being periodically updated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.