You have no DC bias point for the inverting input. Add a high value resistor to somewhere, such as GND.
Keith
Hi ZohraDear all,
Anybody help me to analyze the circuit. I am using it for my project and I need somebody help me to understand it.
Many thanks,
Please say what do you want to do with the circuit. Because as it is, it seems incomplete. You may want to move the thread from microntrollers to a more suitable section to get more help.
Well , another question : do you know what i mean by DC feedback and what is the advantage of a DC feedback in an integrator ?Dear goldsmith,
Actually I am trying to use circuit as pure integrator. This is the main reason to not to use dc gain.
Actually I am trying to use circuit as pure integrator.
I am using as decoupling capacitor to stop any dc component of the signal and let the ac signal pass and send it to the integrator.
Albert, did I understand you right? We shall say what we "want to do with the circuit"?
Perhaps we should ask you what your application is.
When I replied to this post it was marked as "unanswered" probably my fault was not refreshing my browser while I was typing. My aim was to help and luckily, for me, zohra got my point.
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Nose C1 I am using as decoupling capacitor to stop any dc component of the signal and let the ac signal pass and send it to the integrator.
Oh, I`m sorry, albert. At the moment of writing I was of the opinion that YOU was the originator of the thread. Please, forgive me.
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But unfortunately this capacitor blocks also the dc bias current, which is needed by each opamp.
Why don`t you inform you about working integrator circuits before blindly starting into such experiments (Internet, textbooks)?
Sorry Lvw I didn't just close my eyes and start building the circuit. Practically I am achieving the good results. I just need to explain it theoretically. I am not able to explain very clearly perhaps. See the attached image, in this image you can see the input and output response.
Results achieved in practice or with a simulation program? If simulation - real or ideal opamp model? With the circuit as shown in post#6 ?
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