Method and apparatus for reducing electromagnetic interference and emission associated with computer network interfaces
US5223806A · kind A · utility
46Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Aug 23, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A computer network interface ("NIC") exhibits reduced electromagnetic interference and emission through capacitively coupling an output transformer center tap both to reference ground and to logic ground of the NIC's transceiver. Transmit signal lines on both sides of the transceiver are also capacitively coupled to both grounds. Other aspects of the invention reduce electromagnetic interference and emission through improvements in the construction of the NIC printed circuit board and the technique for intercoupling a plurality of NIC's using shielded twisted-pair cable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.