Triangular waveform is generated by a combination of two integrated circuit operational amplifiers, one to produce square wave and other to integrate square wave and generate triangular wave

Thompson, J. P.

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December 1971	 Brief 71-10469 
NASA TECH BRIEF 
Ames Research Center
	
_4V 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield,' Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology. Utilization Office, NASA, Code KT, Washington, D. F. 20546. 
Low-Frequency Triangular Wave Generator 
The problem: 
To generate a low-frequency triangular waveform, 
utilizing a minimum number of discrete circuit 
components.
+v —v
the frequency over a range of 10 to 1. With resistor 
R3 set at 499 k, the output slope can be varied over 
the range of 150 mV/sec to 2.5 V/sec. With R3 set 
at 22 M, the range is 10 to 150 mV/sec. 
to: The solution:	
Technology Utilization Officer A combination of two integrated circuit opera-
	 Ames Research Center 
tional amplifiers, one to produce a square wave and
	 Moffett Field, California 94035 
the other to integrate the square wave and generate
	 Reference: TSP7I-10469 
a triangular wave. 
Hove it's done: 
The circuit (see fig.) uses two integrated circuit 
operational amplifiers to produce a symmetrical, 
subaudio triangular wave. The first amplifier, Al, 
generates a square wave, which is integrated by 
amplifier A2. The output amplitude may be varied 
over a range of 3 to 16 V peak-to-peak by adjusting 
potentiometer RI. Adjusting potentiometer R2 varies
Patent status: 
No patent action is contemplated by NASA. 
Source: J. P. Thompson of

Lockheed Missiles & Space Co.

under contract to

Ames Research Center

(ARC-10259)
Category 01 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States	 will be free from privately owned-rights.
https://ntrs.nasa.gov/search.jsp?R=19710000466 2020-03-17T02:25:28+00:00Z


Low-frequency triangular wave generator

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