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Browse Prior Art Database

Sample Pulse Driver

IP.com Disclosure Number: IPCOM000096688D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Chin, WB: AUTHOR

Abstract

This pulse driver provides high currents in an input or output direction. The currents exceed the maximum power dissipation of active elements included in the driver without damage. The magnitude of the pulses is readily controlled through design choices.

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Sample Pulse Driver

This pulse driver provides high currents in an input or output direction. The currents exceed the maximum power dissipation of active elements included in the driver without damage. The magnitude of the pulses is readily controlled through design choices.

Transistor 20 having collector 22, base 24 and emitter 26 is connected in common emitter circuit configuration. Input circuit 28 is connected to base 24. Circuit 28 is biased by resistor R1 connected to voltage supply 30 of polarity depending upon the conductive characteristic of transistor 20. Load resistor R2 and transformer primary 32 are connected in the transistor 20 collector circuit. Output circuit 34 including diode 36 is also connected to collector 22. Primary 32 is coupled to secondary winding 32' connected across base 38 and emitter 40 of transistor 42. Collector 44 of transistor 42 is returned to supply voltage 30. Emitter 40 is returned to the anode side of diode 36 in output 34.

Transistor 20 conducts for an input signal level V1. Diode 36 is forwardly biased and the output voltage is approximately at ground. When the input changes from the up or V1 level to a down or V2 level, transistor 20 is rendered nonconducting. A positive pulse is transformer coupled into transistor 42 which becomes conducting. Diode 36 is reversely biased by the collector potential of reversely biased transistor 20. Capacitive load C charges due to current flow in an output direction when transistor 42 conducts. The output voltage rises as C charges. The capacitive current is given by the relationship Io = C delta Vo / 4 to, where C is the magnitude of the capacitor, delta Vo is the change in voltages a...