SWD FM receiver circuit
US3942120A · kind A · utility
9Cited by
10References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Jul 22, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/125
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An FM tuner for feeding an IF section of a receiver circuit includes an antenna signal input circuit with broad band response to signals in a selected FM broadcast band. A mixer is connected to receive the signal from the input circuit and a variable local oscillator is connected to the mixer operating for high side injection to produce an IF signal centered within an RF band of minimal signal content and to produce an image displaced outside the response of the input circuit. An SWD filter connected to the output of the mixer has narrow band response at the IF frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.