Programmable dynamic line-termination circuit
US5726583A · kind A · utility
Inventor
Key dates
| Filing date | Jul 19, 1996 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Jul 19, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0298
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A dynamic termination circuit is disclosed that has a plurality of parallel termination elements that respond successively to a signal transition and which are selectively enabled and disabled to provide a desired impedance match with a transmission line. Each termination element includes a first dynamic resistive path between a voltage supply line and that termination element's output and a second dynamic resistive path between the termination element output and ground, both resistive paths including field-effect transistors whose control gates are responsive to a signal received from the transmission line via an input to the circuit. For successive response, a series of delay elements are provided between the circuit input and the respective termination circuit elements. For selective enablement, logic gates connected between the termination element inputs and the field-effect transistor control gates have enable inputs receiving user-programmable enable signals for the respective termination elements. In addition to the impedance provided by the main dynamic resistive paths to voltage supply and ground, at least one of the termination elements may have supplemental dynamic resis…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.