Impedance-matching circuit using negative low-noise resistance
US4180786A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1978 |
| Grant date | Dec 25, 1979 |
| Priority date | — |
| Expiry date | Jul 31, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/28
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit is disclosed for impedance matching an electrical signal-generating transducer to an electrical signal-processing amplifier while substantially retaining both the original signal-to-noise power ratio and the original signal amplitude at the input to the amplifier. A load resistance of a value substantially equal to twice the characteristic resistance of the transducer is coupled across the amplifier input, while a negative low-noise resistance approximately equal in magnitude to the source resistance is coupled in series with the load resistance. A transmission line having a characteristic impedance approximately equal to the transducer resistance is coupled between the transducer output and the series-coupled load resistance and negative resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.