Browse Prior Art Database

Pulse Stretcher

IP.com Disclosure Number: IPCOM000096067D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Fritz, HE: AUTHOR [+2]

Abstract

This circuit is controlled at its gate terminal to produce at its output. terminal a stretched pulse. This has the amplitude of a pulse received at the input terminal. Transistor T1 and associated components R1, R2 and C2 are connected as an emitter-follower to amplify the current of pulses from the input. The voltage at the emitter of T1 is at about ground in the absence of a pulse and at about the voltage of the pulse when a pulse appears at the input. Transistor T2 is connected with capacitor C1 in its emitter circuit to charge C1 to about the voltage at the input terminal. When a pulse appears at the input terminal, a corresponding voltage appears across C1 until the capacitor is discharged.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 90% of the total text.

Page 1 of 2

Pulse Stretcher

This circuit is controlled at its gate terminal to produce at its output. terminal a stretched pulse. This has the amplitude of a pulse received at the input terminal. Transistor T1 and associated components R1, R2 and C2 are connected as an emitter-follower to amplify the current of pulses from the input. The voltage at the emitter of T1 is at about ground in the absence of a pulse and at about the voltage of the pulse when a pulse appears at the input. Transistor T2 is connected with capacitor C1 in its emitter circuit to charge C1 to about the voltage at the input terminal. When a pulse appears at the input terminal, a corresponding voltage appears across C1 until the capacitor is discharged.

Transistors T3 and T4 and associated components are connected to form a current source that can be switched on and off. When the current source is turned on, it discharges C1 and it biases T1 for class A operation to prepare for another input pulse. The current source is turned off just before a pulse appears at the input, thus keeping T1 in class A operation until the peak of the pulse is reached.

The values of Z1 and R4 are chosen to establish the selected current level of the current source. Components T4 and R3 cooperate to turn on and off T3 when a gate pulse is applied. Components D1, C3 and R5 cooperate to bias the emitter of T3 to help turn off T3. Transistor T5 is connected with components R6, R7 and D2 to form a second current source. This curren...