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Browse Prior Art Database

Cyclical Pulse Pattern Generator

IP.com Disclosure Number: IPCOM000094884D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Rodriguez, RO: AUTHOR

Abstract

This shaping circuit provides a gradually increasing, variable duty cycle output square wave from a fixed duty cycle input pulse.

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Cyclical Pulse Pattern Generator

This shaping circuit provides a gradually increasing, variable duty cycle output square wave from a fixed duty cycle input pulse.

The negative input pulse at the base of transistor 10 drives it into saturation and its collector rises to +12 volts, charging capacitor 12 to this voltage. Capacitor 14 begins to charge through resistor 15 and potentiometer 16. Unijunction transistor 18 fires and discharges capacitor 14 when the voltage at element 20 exceeds the threshold voltage between it and element 22. When transistor 18 fires, a negative pulse is developed at element 24 and transistor 18 recovers, permitting capacitor 14 to recharge, but at a slower rate due to the lower voltage across capacitor 12.

As before, when the potential at element 20 reaches its threshold voltage, transistor 18 fires. This sequence continues until the voltage at element 20 is insufficient in amplitude to cause transistor 18 to conduct. Before this takes place, however, a new charging cycle may be started by another input pulse. The circuitry of transistors 26 and 28 comprises an output amplifier. The duration of the pulses t1...t5 is determined mainly by the time constant of resistor 16 and capacitor 14.

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