1.
What is your sinewave generator's impedance? According to your schematic, it sees a load consisting of C2-R2-C10, which might be as low as 300 ohms. This may be causing distortion of your sine wave.
2.
Does the problem occur when the AC input is above 8.4 V nominal? That produces 24 V peak-to-peak. That's the limit you would expect to get from an op amp with a 24V single supply.
Another possibility: Does the input ever peak higher or lower than the supply to the op amp? If so then it might bring out odd behavior. Operating guidelines for IC's commonly advise against this.
Some op amps are known to develop 'output latch up' when their inputs receive a volt level higher or lower than the supply rails. Example, TL082.
There is also the chance that the capacitor charge might swing up or down suddenly due to surges or drains on the supply. Several cycles must go by as they re-gain their balanced volt level.
I may have missed it but what frequency are you driving it with? It sound like you are using a square wave drive?
Have you looked at the differential input voltage? There is a limit of +/-4V so if you manage to exceed that some parasitic transistors may turn on.
Keith.
I meant a resistor in series with the opamp output - not the final load. The capacitive load I am talking about is the various capacitors you have connected to the opamp output. It is difficult to read the values and the connections are covered by a text box, but I believe they are 10uF and will indirectly be capacitively loading the opamp.
Keith.
Many op amps have cross-clamped inputs and high
differential input voltage will cause high input offset and
input bias current. If the output (through its feedback
network) can't follow IN+ then you'll see the loop come
apart and all kinds of funny.
...So, I have an opamp circuit that has been having problems when I drive it with a large signal. ...
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