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Folded-Cascode Comparator slew rate ?

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hsiangleung

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can anyone help me explain why the slew rate of the Folded-Cascode Comparator as shown in the figure below is I3/CL? thanks very much!
Capture.PNG
 

If there is a large enough input voltage difference between vp and vn, all of I3 flows through either M1 or M2. This means that there is a current imbalance in the cascode stage, which is being levelled out by sinking/sourcing additional current to/from the output capacitor, which equals I3. So the fastest this can be done is I3/CL which translates to A/((A*s)/V) = V/s = Slew Rate.
 

Maximum difference current can only be I3. I=C*dV/dt.
Solve.
 

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