Circuit for preventing VCXO mode jumping
US5053726A · kind A · utility
8Cited by
14References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Apr 10, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/099
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator includes a mechanical resonator, such as a crystal, and having an amplifier arranged for oscillating at a first frequency. A resonant circuit is coupled in series with the crystal. The resonant circuit is antiresonant at an undesired harmonic frequency of the crystal thus prohibiting oscillation of the oscillator at said undesired harmonic frequency. The present oscillator is a portion of a phase locked loop used in a television receiver for demodulating a composite stereophonic audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.