Electrical Engineering

I am planning to use the LM318 operational amplifier to generate a PWM signal and I need to know how to calculate the rise/fall time.

-The slew rate is 70 V/µs maximum
-Slew rate can reach 150 V/µs But with a condition of "feedforward compensation will boost the slew rate to over 150 V/μs and almost double the bandwidth."

As suggested from Mr. Olin, here is my calculation:
the LM318 offers 70 V/µs and the output voltage that I need is 18 V so:
(18 V) / (70 V/µs) = 0.257143 µs = 257.143 ns.

And then I did this: (257.143/5)×4 = 205.714 ns.
Because the rise/fall time start at 10% and end at 90%.

And in case of 150 V/µs this is going to be:
(18 V) / (150 V/µs) = 0.12 µs = 120 ns (120/5)×4 = 96 ns.
Is my calculation correct?

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Is it possible to calculate the rise/fall time of an operational amplifier ?

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