Protection circuit for a subscriber line interface circuit
US7907381B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2008 |
| Grant date | Mar 15, 2011 |
| Priority date | — |
| Expiry date | Jun 5, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention provides a protection circuit coupled to a tip lead and a ring lead in a subscriber line interface circuit formed on a silicon substrate. The protection circuit includes first and second diodes formed on the silicon substrate and coupled to the tip lead and the ring lead, respectively. The first and second diodes are configured to provide a path from the tip lead or the ring lead to ground in response to a positive voltage at the tip lead or the ring lead. The protection circuit also includes a silicon-controlled rectifier formed on the silicon substrate and configured to provide, in response to a negative voltage at the tip lead or the ring lead, a path from the tip lead or the ring lead to ground via the silicon-controlled rectifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.