Resistive line feed circuit
US4736415A · kind A · utility
5Cited by
3References
8Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jul 5, 1985 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | Jul 5, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This is an improved resistive line battery feed circuit where the improvement consists in establishing a balanced stable power point using an opamp and capacitive input and feeding the AC output to both lines of the tip and ring circuit via opamps and a hybrid for injecting current. In this manner longitudinal balance is maintained. Current is added to the line circuit by a modulated DC current source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.