CATV converter having improved tuning circuits
US4619000A · kind A · utility
Inventor
Key dates
| Filing date | Sep 24, 1984 |
| Grant date | Oct 21, 1986 |
| Priority date | — |
| Expiry date | Sep 24, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J3/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The disclosure describes an improved CATV converter that incorporates an intermediate frequency filter and amplifier unit that includes first and second tunable circuits. Each tunable circuit has a fixed capactive element and a variable inductance means for tuning the tunable circuit. The first and second tuned circuit are transmissively coupled to one another through a slit in a shield which otherwise shields one tunable circuit from another. The intermediate frequency filter and amplifier unit also includes an FET for amplifying a narrow band intermediate frequency signal and a third tunable circuit comprising the output capacitance of the FET and a variable inductance means for tuning the third tunable circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.