Design an opamp circuit with this transfer function on 3 voltage inputs

In summary, the conversation discusses building a circuit for a given operation on three voltages. The circuit uses a voltage summer and integrator to calculate the capacitance and resistance needed. The negative capacitance is caused by the signal being inverted by the op-amp based Miller integrator. It is also mentioned that the conversation is related to a homework assignment.
  • #1
DaniilMP3
2
0
TL;DR Summary: Build a circuit of given operation on voltages

I'll appreciate any help.
I need to create circuit of this operation on three voltages:
CodeCogsEqn (1).png

We'll use circuit of voltages summer:
Screenshot_2.png


The third term is the integral of U_3, so we'll use integrator:
Screenshot_3.png


Than, calculate capacitance:
CodeCogsEqn (4).png

And on this step we have negative capacitance. Is it possible? Or I did something wrong?
Next, we calculate R_1, R_2.
Screenshot_4.png

And here we have -44 kilo Ohm for R_2.
 
Physics news on Phys.org
  • #2
Welcome to PF.

Is this homework?

The negative sign comes from the simple op-amp based Miller integrator inverts the signal. If you want to cancel the negative sign, you will need to invert the signal in that branch, before or after the integration.
 
  • #3
Hi, yes. This is homework. Thank you for your response.
 
Last edited:
  • #4
DaniilMP3 said:
Hi, yes. This is homework.
(Thread moved to the schoolwork forums)
 

Similar threads

  • Engineering and Comp Sci Homework Help
Replies
4
Views
758
  • Engineering and Comp Sci Homework Help
Replies
0
Views
725
  • Engineering and Comp Sci Homework Help
Replies
1
Views
506
  • Engineering and Comp Sci Homework Help
Replies
4
Views
2K
  • Engineering and Comp Sci Homework Help
Replies
18
Views
2K
  • Engineering and Comp Sci Homework Help
Replies
5
Views
1K
Replies
2
Views
686
  • Engineering and Comp Sci Homework Help
Replies
4
Views
2K
  • Engineering and Comp Sci Homework Help
Replies
13
Views
2K
  • Engineering and Comp Sci Homework Help
Replies
4
Views
2K
Back
Top