The circuit shown in the figure is a triangular wave generation circuit that can adjust the amplitude to an accuracy of about ±0.01V. If a DC voltage is applied to the V REF and V-REF terminals, the amplitude of the triangle wave is the V REF and V-REF peaks, respectively.
This circuit combines the integrator and two comparators that determine the positive and negative peaks. The comparator at one end of the positive peak is positive if the output is positive, Dl is self-locked, and the comparator inverting output at one end of the negative peak is negative. If you change R1 to a potentiometer, you can change the frequency and keep the amplitude constant. If you want to change the symmetry of the waveform, connect a 50kΩ potentiometer to the positive and negative power supplies. Slide the contact to the inverting terminal of the LM119. If a sine wave is to be generated, an accurate triangular wave is added to the nonlinear circuit for synthesizing the sine wave. To reduce distortion, you need to fine-tune the amplitude. The oscillation frequency of the circuit is:
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According to the frequency requirement, meet the requirements by selecting R1, C1 and V REF, V-REF. If V REF=2.5V, V-REF=-2.5V, R1=1k, and C1=0.1μF, fo=5kHz can be calculated. The maximum operating frequency of this circuit is 200kHz.
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