The Godfather talking
You can run, but you can't hide.
Sonsivri
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
December 09, 2016, 06:24:32 18:24


Login with username, password and session length


Pages: [1]
Print
Author Topic: Opamp feedack: series RC  (Read 962 times)
0 Members and 1 Guest are viewing this topic.
qolpa
Newbie
*
Offline Offline

Posts: 27

Thank You
-Given: 17
-Receive: 5


« on: May 24, 2010, 01:52:13 13:52 »

Hi all,

I have been wondering for a long time what is the purpose of series R2 C2?(see attached) The other part of circuit is not important.

I think it is some kind of filter but how can we calculate the corner freq, is it like basic low-pass or high pass RC? (1/2*pi*R*C ??)

Any help would be appreciated..
Logged

when everthing else fails, read the instructions
gopi_sonsivri
Newbie
*
Offline Offline

Posts: 22

Thank You
-Given: 18
-Receive: 25


« Reply #1 on: May 24, 2010, 02:16:46 14:16 »

it is circuit for integrator

i think the order of filter is fixed by the R2,C2 (second order)

Just read some book on Linear Integrated Circuits
Logged

click  thanks if you like mypost
hate
Hero Member
*****
Offline Offline

Posts: 556

Thank You
-Given: 156
-Receive: 354


« Reply #2 on: May 25, 2010, 11:45:30 11:45 »

The impedance of the feedback circuit consisting of C1,C2,R2 is Z=(R2*C2*s+1)/[R2*C1*C2*s*s+(C1+C2)*s] which looks like a bandpass filter. And the input output relationship is Vo=[5*(R1+Z)/R1]-Vi*Z/R1. If the non-inverting input should be grounded instead of being connected to 5v, the transfer function would consist of only the 2nd term and this would look like a bandpass filter to me. With the non-inverting input connected to 5v it looks like a mixer with filtering capabilities. Try to Bode plot the transfer function!

Regards...
Logged

Regards...
Pages: [1]
Print
Jump to:  


DISCLAIMER
WE DONT HOST ANY ILLEGAL FILES ON THE SERVER
USE CONTACT US TO REPORT ILLEGAL FILES
ADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS

... Copyright 2003-2999 Sonsivri.to ...
Powered by SMF 1.1.18 | SMF © 2006-2009, Simple Machines LLC | HarzeM Dilber MC