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Speed Up of Single Shot Transition Time

IP.com Disclosure Number: IPCOM000074552D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Walker, RE: AUTHOR

Abstract

This single-shot circuit provides transition time of 10 to 20 nano seconds regardless of whether the input pulse is longer or shorter than the timed output pulse of the circuit. Where the input pulse is of a shorter duration than the timed output pulse, a feedback circuit is required in the single-shot and under this condition, the desired transition time of 10 to 20 nano seconds is obtainable. However, when the input pulse of a longer duration than the timed output pulse inputted into a single-shot having a feedback circuit, a problem exists.

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Speed Up of Single Shot Transition Time

This single-shot circuit provides transition time of 10 to 20 nano seconds regardless of whether the input pulse is longer or shorter than the timed output pulse of the circuit. Where the input pulse is of a shorter duration than the timed output pulse, a feedback circuit is required in the single-shot and under this condition, the desired transition time of 10 to 20 nano seconds is obtainable. However, when the input pulse of a longer duration than the timed output pulse inputted into a single-shot having a feedback circuit, a problem exists.

Under these conditions, the transition at the end of the single-shot time can become very long (up to 5 milli seconds) due to the condition that the voltage level of the feedback loop becomes more positive than the voltage level of the input signal. Therefore, the input signal voltage continues to govern the charge of capacitors C1 and C2 instead of the output signal voltage during the transition period.

By adding diode D1 in series with input diode D2, the effective voltage of the input circuit to the single-shot will always be more positive than the feedback voltage and will cause the transition time of the end of the single-shot time to be in the 10 to 20 nano second range.

This allows single-shot circuits to have one basic design for both long and short input pulse requirements.

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