Electronic side of line detector
US3939308A · kind A · utility
1Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1974 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | Sep 27, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q5/24
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A side of line detector with a single operational amplifier with adjustable output. The amplifier input is protected from positive and negative voltage spikes by diodes. Two transistors are coupled to the amplifier to set a comparator voltage reference which allows the rejection of leakage and noise. Test points are provided in the circuit to facilitate testing particular subcircuits and to allow the initial adjustment of the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.