Resistive line circuit
US4554412A · kind A · utility
6Cited by
8References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1984 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Jul 23, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Resistive battery feed circuits are normally not used because of lack of power supply noise rejection and attendant crosstalk coupling. In this circuit the opamp and surrounding circuitry insure that power supply and ground noise do not couple into the tip and ring circuits as a metallic signal and improve crosstalk attenuation. In addition, the opamp is used to split the 48 volt supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.