Parallel analog and digital control loops for phase locking precision oscillator to reference oscillator
US4107623A · kind A · utility
10Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1977 |
| Grant date | Aug 15, 1978 |
| Priority date | — |
| Expiry date | Jun 14, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/148
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A control device for accurately maintaining the frequency of a quartz crystal oscillator. The control device includes reference oscillators and two control loops in parallel, a first digital control loop providing coarse adjustment of the quartz oscillator frequency and a second, analog control loop providing fine adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.