Engineering Design Op Amp Circuit: Low-Pass Filter to G(s)=10/(s+10)

AI Thread Summary
The discussion focuses on designing an op-amp circuit to achieve a low-pass filter with the transfer function G(s) = 10/(s + 10). The absence of a negative sign in the transfer function suggests the use of a non-inverting operational amplifier configuration. A proposed solution involves using a passive R-C low-pass filter combined with a voltage follower to buffer the output. The design requires four resistors and two capacitors, with specific values where two resistors are ten times the value of the others. The input is connected to the non-inverting input of the op-amp.
MEM33
Messages
22
Reaction score
0

Homework Statement


Design an op amp circuit that acts as low-pass filter with the following transfer function

G(s) = 10/(s +10)

Homework Equations



Inverting operational amplifier Vo(s)/Vi(s) = Z2(s)/Z1(s)

Non-inverting operational amplifier Vo(s)/Vi(s) = Z1(s) + Z2(s)/ Z1(s)

The Attempt at a Solution



The fact that there is no negative sign in the transfer function leads me to believe I need to use the non-inverting equation, but I can't seem to find any combination of components that cancel out and gives me the given transfer function.
 
Physics news on Phys.org


I think you can get that single pole with a passive R-C low-pass filter. Can you buffer its output with a voltage follower?
 


Takes 4 R's and 2 C's. The two C's have the same value, and 2 of the R's are 10 times the value of the other two. Yes, the input is via the + op amp input pin.
 
Back
Top