Lockup inhibiting arrangement for a phase locked loop tuning system
US4110693A · kind A · utility
8Cited by
8References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1977 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Jan 24, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J5/0272
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a phase locked loop tuning system for a television receiver including a frequency divider for prescaling the frequency of a local oscillator signal generated by a controlled oscillator, a lockup inhibiting arrangement is provided for causing the controlled oscillator to temporarily oscillate at a frequency for which the amplitude of the local oscillator signal is sufficiently high to overcome any self-oscillation of the prescaler before phase locked loop control is enabled whenever the receiver is initially turned on or when a channel in a new band is selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.