Browse Prior Art Database

Bilevel Pulse Stretcher

IP.com Disclosure Number: IPCOM000082088D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Shakib, J: AUTHOR

Abstract

The duration of short-term positive or negative pulses is extended by interconnecting single-shot circuits. The circuit is particularly useful where short duration trigger signals must be transmitted over long transmission lines, which tend to degrade short-term pulses. Logic circuitry commonly couples the single-shot outputs into a transmission line and the single-shots are interconnected for degating purposes.

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Bilevel Pulse Stretcher

The duration of short-term positive or negative pulses is extended by interconnecting single-shot circuits. The circuit is particularly useful where short duration trigger signals must be transmitted over long transmission lines, which tend to degrade short-term pulses. Logic circuitry commonly couples the single- shot outputs into a transmission line and the single-shots are interconnected for degating purposes.

By way of example, the circuit shown will stretch any received pulse at the signal input 10 to a pulse of at least 150 ns duration, for either polarity of level change at input 10. In the circuit, single-shots A and B insure that the output signal at 20 stays at a down or an up level, respectively, for the 150 ns period. Degating the input of either single-shot by the output of the other, insures that they will not have destruction effect on each other. The thruput delay for the circuit can be about 35 ns. The minimum duration of up or down level can be varied by changing the RC network of the appropriate single-shots. The time- base diagram illustrates exemplary operations, wherein trigger pulses of 25 ns produce output pulses of 150 ns for coupling to an extended transmission line at
20.

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