Documentation

Slew Rate of Triangular Waveform

This example shows how to use the slew rate as an estimate of the rising and falling slopes of a triangular waveform. Create three triangular waveforms. One waveform has rising-falling slopes of $±2$, one waveform has rising-falling slopes of $±\frac{1}{2}$, and one waveform has a rising slope of $+2$ and a falling slope of $-\frac{1}{2}$. Use slewrate to find the slopes of the waveforms.

Use tripuls to create a triangular waveform with rising-falling slopes of $±2$. Set the sampling interval to 0.01 seconds, which corresponds to a sample rate of 100 hertz.

dt = 0.01;
t = -2:dt:2;

x = tripuls(t);

Compute and plot the slew rate for the triangular waveform. Input the sample rate (100 Hz) to obtain the correct positive and negative slope values.

slewrate(x,1/dt) ans = 1×2

2.0000   -2.0000

Change the width of the triangular waveform so it has slopes of $±\frac{1}{2}$. Compute and plot the slew rate.

x = tripuls(t,4);
slewrate(x,1/dt) ans = 1×2

0.5000   -0.5000

Create a triangular waveform with a rising slope of $+2$ and a falling slope of $-\frac{1}{2}$. Compute the slew rate.

x = tripuls(t,5/2,-3/5);
s = slewrate(x,1/dt)
s = 1×2

2.0000   -0.5000

The first element of s is the rising slope and the second element is the falling slope. Plot the result.

slewrate(x,1/dt); 