Input expansion for crosspoint switch module
US5870028A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1997 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Mar 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/6264
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input expansion for a crosspoint switch module incorporates a plurality of crosspoint switch ICs within the switch module so that the crosspoint switch module may receive a plurality of input differential signals. The crosspoint switch module includes a module driver circuit which, when enabled by a module enable signal, couples a differential current signal to an output. Each crosspoint switch includes an emitter follower configured transistor circuit for receiving one of the input differential signals and providing an output differential signal and a switch transistor circuit configured as a saturated switch for receiving the output differential signal and providing the differential current signal when enabled by a switch enable signal. Only one of the crosspoint switches is enabled at a time so that only one of the crosspoint switches carries current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.