Frequency controlled oscillator utilizing an U/D counter in the feedback
US4654604A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1986 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Feb 6, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A frequency controlled oscillator arranged to be fabricated in integrated circuit form including a primary frequency controlled oscillator and a secondary frequency controlled oscillator with a counter arranged to periodically count pulses of the oscillation frequency of the secondary frequency controlled oscillator and to produce a first output signal if the count is less than a predetermined value and to produce a second output signal if the count is greater than a predetermined value, and control means providing a bias control signal in dependence on the output signals of the counter for tuning the oscillation frequency of both the secondary frequency controlled oscillator and the primary frequency controlled oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.