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I need to specify the (W/L) ratio of transistors and the value of the current source in an amplifier as shown in this picture enter image description here

so that these specifications are met:

*the height of the input step for evaluating settling time is 0.25v.

I tried to approach it by first using the settling time to evaluate slew rate and wt and then using the approximation of wt = wp*gain but didn't succeed.

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Each transistor has a specific purpose.

Define the operating voltage for each transistor.

Define the needed current for each transistor.

And each transistor may need a specific transconductance, to assist certain circuit gains and bandwidths and output currents.

When you have defined the voltage and the current, then you can compute the W/L.

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