TF EIM Chapt3

Differentiator circuit

Consider the effect of a low-pass filter on a rectangular shaped input pulse with a width [math]\tau[/math] and period [math]T[/math].

The first thing to consider is what happens to the different parts of the square pulse as it travels to the circuit.

You know that the circuit, as a high pass filter, will tend to attenuate low frequency (slow changing) voltages and not high frequency (quick changing) voltages.

This means that points [math]a[/math] and [math]b[/math] in the pulse shown below should pass through the circuit while the DC level parts would not.

Integrator

Forest_Electronic_Instrumentation_and_Measurement