Browse Prior Art Database

Dynamic Active Terminator Circuit

IP.com Disclosure Number: IPCOM000087725D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Bode, J: AUTHOR [+2]

Abstract

A terminator at the end of a transmission line is desirable to improve AC performance. However, the constant presence of a terminator produces DC loading and a consequent reduction in drive capability.

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Dynamic Active Terminator Circuit

A terminator at the end of a transmission line is desirable to improve AC performance. However, the constant presence of a terminator produces DC loading and a consequent reduction in drive capability.

The dynamic active terminator circuit shown provides transmission line termination only during the positive transition on a transmission line. Overshoot is suppressed by the presence of the terminator. The terminator does not DC load the transmission line.

The terminator is activated when node A rises in the order of 100 MV above its down-level state, turning transistor T1 on. T1 remains on throughout the remainder of the rising transition and applies terminator resistor R3 to transmission line node A for a time period determined by capacitor C1 and resistor R2.

Resistor R1 and Schottky diode D1 develop a bias voltage in the order of 100 MV below the threshold of T1 to insure maximum sensitivity.

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