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Triangular Wave Generator

2018-01-31 15:03  
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The op-amp triangular-wave generator is another example of a relaxation oscillator.We know that the integrator output waveform will be triangular if the input to it is a square-wave. It means that a triangular-wave generator can be formed by simply cascading an integrator and a square-wave generator, as illustrated in figure. This circuit needs a dual op-amp, two capacitors, and at least five resistors. The rectangular-wave output of the square-wave generator drives the integrator which produces a triangular output waveform. The rectangular-wave swings between Vsatand -Vsatwith a time period determined from equation. The triangular-waveform has the same period and frequency as the square-waveform. Peak to-peak value of output triangular-waveform can be obtained from the following equation.

triangular wave generator

triangular wave generator

The input of integrator A2is a square wave and its output is a triangular waveform, the output of integrator will be triangular wave only when ?R4C2> T/ 2 where T is the ( period of square wave. As a general rule, R4C2should be equal to T. It may also be necessary to shunt the capacitor C2with resistance R5= 10 R4and connect an offset volt compensating network at the non-inverting ( ) input terminal of op-amp A2so as to obtain a stable triangular wave. Since the frequency of the triangular-wave generator like any other oscillator, is limited by the op-amp slew-rate, a high slew rate op-amp, like LM 301, should be used for the generation of relatively higher frequency waveforms.


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