H-F Portion of TV receiver
US4313222A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1980 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | May 12, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0017
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The output electrode of a field effect transistor of a high-frequency input stage is connected to a capacitively coupled input (gate) electrode of the field effect transistor of a mixer stage through one of a pair of bifilarly wound coils provided on a ferrite core, while the second of these coils connects the same input of the mixer stage to the output of a local oscillator in such a way that two signal paths leading towards the mixer stage, respectively for the high-frequency signal and the oscillator signal, go through coupled coils in opposite winding directions. The result is that the path for signals in either direction between the local oscillator and the input stage are of much higher impedance than the paths for signals proceeding to the mixer stage respectively from the input stage and from the local oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.