R-C circuit differentiator

[Patrick Chung]

R-C circuit differentiator is classic with passive components that can differentiate voltage signal. For step input R-C circuit differentiator makes spikes on the output, so it differentiate step input signal better then the op-amp differentiator circuit. Now, there is a new tutorial


http://www.cirvirlab.com/index.php/electric/103-r-c-circuit-differentiator.html


and online simulation


http://www.cirvirlab.com/simulation/r-c_circuit_differentiator_online.php

 

[Helmut Wabnig]

On Tue, 6 Aug 2013 03:47:12 -0700 (PDT), Patrick Chung
<pchung705@gmail.com> wrote:

R-C circuit differentiator is classic with passive components that can differentiate voltage signal. For step input R-C circuit differentiator makes spikes on the output, so it differentiate step input signal better then the op-amp differentiator circuit. Now, there is a new tutorial


http://www.cirvirlab.com/index.php/electric/103-r-c-circuit-differentiator.html


and online simulation


http://www.cirvirlab.com/simulation/r-c_circuit_differentiator_online.php

In your simulation the peak of Vout is always at 100% of the input
voltage.
This is not what you will find in real circuits.
The signal source must have an Ri.

w.

 

[amdx]

On 8/6/2013 7:20 AM, Helmut Wabnig wrote:

On Tue, 6 Aug 2013 03:47:12 -0700 (PDT), Patrick Chung
pchung705@gmail.com> wrote:

R-C circuit differentiator is classic with passive components that can differentiate voltage signal. For step input R-C circuit differentiator makes spikes on the output, so it differentiate step input signal better then the op-amp differentiator circuit. Now, there is a new tutorial


http://www.cirvirlab.com/index.php/electric/103-r-c-circuit-differentiator.html


and online simulation


http://www.cirvirlab.com/simulation/r-c_circuit_differentiator_online.php


In your simulation the peak of Vout is always at 100% of the input
voltage.
This is not what you will find in real circuits.
The signal source must have an Ri.

w.

I didn't see that, I dropped the frequency to 1 khz and the output

peak was about 1/2 the input.
Mikek