Local oscillation circuit for tuner having reduced inter-channel deviation in AFC sensitivity
US3959728A · kind A · utility
8Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1975 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Jan 15, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2201/0208
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A local oscillation circuit for a tuner having a reduced inter-channel deviation in AFC sensitivity. The local oscillation circuit comprises a resonance circuit capable of varying a tuning frequency by means of a variable capacitive element additionally provided with a variable capacitive diode which is applied with a control voltage in dependence upon variation in the frequency detected from the output signal of the tuner, thereby to effect an automatic frequency control. A single variable capacitive diode is coupled to the variable capacitive element of the resonance circuit in a parallel and a series connections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.