Browse Prior Art Database

Pulse Generator

IP.com Disclosure Number: IPCOM000096420D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Foglia, HR: AUTHOR

Abstract

The circuit shows a pulse generator which utilizes a length of miniature 50 omega coaxial transmission line 10 as a transformer to determine the output pulse width. With no input pulse, line 10 charges up due to the collector bias. When an input pulse causes transistor 12 to conduct, the collector-to-emitter resistance is made very small and a pulse travels down line 10 and is reflected back.

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Pulse Generator

The circuit shows a pulse generator which utilizes a length of miniature 50 omega coaxial transmission line 10 as a transformer to determine the output pulse width. With no input pulse, line 10 charges up due to the collector bias. When an input pulse causes transistor 12 to conduct, the collector-to-emitter resistance is made very small and a pulse travels down line 10 and is reflected back.

Charge neutrality causes current to flow down the other side of line 10 and through the resistor R1, where dissipation occurs. Hence, a pulse of width 2k- 1 is developed across the resistor R1, where 1 is expressed in feet and k is the propagation constant of the transmission line and expressed in ft./sec. The circuit differs from other transmission line pulse generators. Thus, when the transistor conducts, current from the voltage source must flow through the one side of the transmission line. Also, when the transistor ceases to conduct, this current is utilized to charge the line.

The advantages of this circuit over other circuits which utilize discharge lines include faster recharge time (approximately 11 milli-microseconds), isolation of input and output, greater efficiency and simplicity of construction.

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