Oscillator frequency control loop
US4048581A · kind A · utility
7Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 26, 1976 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | May 26, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In an oscillator circuit controlled by a reference frequency a voltage regulated oscillator is controlled by the output voltage from digital-to-analog converter whose digital input is obtained from an up/down counter. The counter is controlled by the output from a frequency difference detector which compares the output of the voltage control oscillator and the reference frequency. A threshold circuit is connected between the frequency difference detector and the activation and up/down control inputs of the counter so that the counter is activated only when the frequency difference exceeds a predetermined amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.