Signal attenuator
US5126703A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 31, 1990 |
| Grant date | Jun 30, 1992 |
| Priority date | — |
| Expiry date | Dec 31, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/255
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A first PIN diode is connected to the input side of a tuner at the front end of an FM receiver, in an AC coupled fashion parallel to the tuner. A correction inductance is connected parallel to the first PIN diode in an AC coupled fashion. The tuner is connected, at its output side, parallel to a series-connected circuit of a correction capacitor and a second PIN didode. The anodes of the first and second PIN diodes are supplied with an automatic gain control (AGC) voltage. When the AGC voltage varies, the resistances of the first and second PIN diodes vary in a manner to adjust the degree to which the correction inductance and the correction capacitor affect the resonance in the tuner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.