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Active Terminator for Transmission Lines

IP.com Disclosure Number: IPCOM000084241D
Original Publication Date: 1975-Oct-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Malaviya, SD: AUTHOR [+2]

Abstract

The terminator depicted permits a transmission line to go up and down in voltage by about half a volt (one Schottky barrier diode drop) from the reference voltage level of its receivers (-1.5 volts). Overshoot and undershoot on the line are, however, suppressed by the terminator to prevent ringing.

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Active Terminator for Transmission Lines

The terminator depicted permits a transmission line to go up and down in voltage by about half a volt (one Schottky barrier diode drop) from the reference voltage level of its receivers (-1.5 volts). Overshoot and undershoot on the line are, however, suppressed by the terminator to prevent ringing.

When the line voltage tends to become more positive than -1 volt, Q5 conducts and Q6 is cut off. The base voltage of Q4 goes up and it draws current from the line to prevent the overshoot.

Similarly, when the line voltage goes more negative than -2 volts, Q3 is turned off and the base voltage of Q1 rises to pull the line up, thereby preventing the undershoot.

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