Browse Prior Art Database

Single Shot

IP.com Disclosure Number: IPCOM000098655D
Original Publication Date: 1959-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Hennis, RB: AUTHOR

Abstract

A transistor single shot is illustrated in which the pulse duration is determined by an RC network under control of an external signal source.

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Single Shot

A transistor single shot is illustrated in which the pulse duration is determined by an RC network under control of an external signal source.

For standard single shot operation the holdover input A is grounded, maintaining T(3) non-conductive. T(1) is normally off and T(2) is normally fully conducting. T(4) is normally lightly conducting (Class A condition). A positive pulse applied at the set input B renders T(2) non-conductive, and its collector potential and the output level drop towards -12 volts. T(4) saturates, clamping the output level at -6 volts. This negative potential change is coupled through capacitor C and the associated resistor network to the base of T(1) turning it on.

The resultant rise in collector potential of T(1) is coupled through the parallel resistance-capacitance network to the base of T(2) to maintain it non-conductive. At a time dependent on its magnitude and the value of the associated resistances, C accumulates sufficient charge to bias T(1) into non-conduction. This lowers the collector potential of T(1), biasing T(2) into conduction and causing a potential rise at the output line to complete the cycle. The rise in output potential biases T(4) off, allowing the capacitor C to discharge to its normal level. This drives T(1) quickly to non-conduction and T(2) rapidly to full conduction, decreasing the rise time of the output pulse.

If a negative potential is applied to the holdover input to render T(3) conductive, its emi...