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Adjustable Pulse Width Single Shot

IP.com Disclosure Number: IPCOM000095256D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Moser, A: AUTHOR

Abstract

The output pulse width of the nanosecond monostable multivibrator is controlled by feedback into a tunnel diode used as a switch, adjustable by a bias current. Transistors T1 and T2 form a current switch with constant emitter current JE. Normally, T1 is turned on and tunnel diode TD is held in its high-voltage condition by adjustable DC bias current JB.

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Adjustable Pulse Width Single Shot

The output pulse width of the nanosecond monostable multivibrator is controlled by feedback into a tunnel diode used as a switch, adjustable by a bias current. Transistors T1 and T2 form a current switch with constant emitter current JE. Normally, T1 is turned on and tunnel diode TD is held in its high- voltage condition by adjustable DC bias current JB.

A negative trigger pulse turns T1 off so that T2 takes over the constant current. TD is switched to its low-voltage condition. A fixed RC network between collector T2 and TD provides a path for feedback current JT through TD, directed oppositely to bias current JB. As long as the current difference is smaller than the TD peak current, i.e., JB - JT < JP, TD remains in its low-voltage state, holding T1 switched off. When the charge current JT decreases to a value that the condition JB - JT> JP holds, TD switches to its high-voltage state causing the current switch T1 and T2 to assume its steady state.

An output signal is taken from collector T1. A positive level exists in the time period when T1 is switched off. The pulse width is controlled by adjusting the DC bias current JB by resistor RB.

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