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1kV from Simple Op Amp Circuit?

Question asked by jk3209402 on Apr 2, 2015
I am getting familiar with ADS and created what I thought was a simple comparator.  I fed in a 1V 1kHz signal compared to ground.  
I expected the output to saturate and get an output that looked like a squarewave.  Instead, I get a 1kV sinewave output.  I'm not sure why the output exceeds its rail voltages, since it appears that it should max out at 0.3V below the rail voltage.

What am I missing here?