Browse Prior Art Database

Low Frequency Square Wave Generator

IP.com Disclosure Number: IPCOM000098480D
Original Publication Date: 1960-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Levitre, EJ: AUTHOR

Abstract

The generator produces square waves in the frequency range from 10 to 100 cps with good stability and without the distortion usually present in multivibrator outputs. PNP transistors T1 and T2 have their emitters grounded and their collectors separately connected to a negative supply through resistor R1. Each transistor has its base connected through a resistor R to the negative supply and by a capacitor C to the collector of the other transistor with the RC product controlling the frequency of oscillation.

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 100% of the total text.

Page 1 of 2

Low Frequency Square Wave Generator

The generator produces square waves in the frequency range from 10 to 100 cps with good stability and without the distortion usually present in multivibrator outputs. PNP transistors T1 and T2 have their emitters grounded and their collectors separately connected to a negative supply through resistor R1. Each transistor has its base connected through a resistor R to the negative supply and by a capacitor C to the collector of the other transistor with the RC product controlling the frequency of oscillation.

The collector of transistor T2 is connected to the base of an NPN transistor T3. Its emitter is connected to the emitter of NPN transistor T4 and through a resistor R2 to a negative supply. The collector of each transistor T3 and T4 is connected through a resistor R3 to ground and a resistor R4 to a positive voltage with an output terminal connecting to the collector of T4.

Transistors T3 and T4 switch conductive states over a narrow range of input voltage from transistor T2. Since this voltage is passed during the switch from conduction in T1 to conduction in T2 and vice versa, the output of T4 is a sharp square wave without droop.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]