buddypoor
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Hi Visjnoe,
I think, you correctly have described the situation. However, it's even worse: Since the "integrator" has (a) a finite dc gain (even without R in parallel to C), and (b) the opamp gain decreases with rising frequencies (and even has a second pole), the phase shift of the "integrator" reaches the ideal value of 90 deg. for ONE frequency wo only! Below wo the phase shift will be less and above wo larger than 90 deg. That means - strictly spoken, a real integration is possible only for one single frequency wo. By the way, because of some other reasons, the situation is about the same if you use an OTA instead of a voltage opamp.
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