op-amp integrator problem

I made this op-amp integrator to have sharp edges triangular pulse in out out but this gives me something corrupted. Please help me to resolve my problem. The capacitor is not necessary so we could easily ignore it.

Welcome to ETO!

aminhosseiny said:

The capacitor is not necessary

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C2 is very necessary. Without it you don't have an integrator!
U1a is clipping the waveform. Try a smaller amplitude input square-wave.

alec_t said:

Welcome to ETO!
C2 is very necessary. Without it you don't have an integrator!
U1a is clipping the waveform. Try a smaller amplitude input square-wave.

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Not C2, I mean C1 is not necessary. Smaller amplitude also won't help!

What happened to the two images in post #1?

I can see them.

What are the op amp supply voltages?
You need both a plus and minus supply for that circuit to work.

First, read these forum postings:

Things to note about my posted integrator circuit:
1. R1 is absolutely necessary to limit the current into the capacitor. You left it out. This allows use of a much smaller capacitor.
2. U1 requires split supplies.
3. R2/C1 time constant is evident in start-up and the fact that the ramp is not linear.
4. R1/C1 time constant controls the peak amplitude of V(out) and determines if the opamp output runs into its own supply voltages.
5. I modeled a near-ideal, rail-to-rail output opamp; yours may not be that good.
6. Note that it inverts.