aryajur said:For the cascode transistors they need to match their Vgs so their W/L should be large, at the same time their ro should be large so as to make the fold node look like a low impedance towards them and most of the small signal current goes through them. The trande off is the noise performace.
aryajur said:The active current mirror is again like a current source so W/L small for improved matching and the trade off is the Vdsat for the output swing. You need to have large ro so that you have good gain.
tshankar501 said:I still doesnt understand why do we need to increase the (W/L) of the cascode transistors in order to increase the ro of that transistor? Will increasing L alone keeping W constant wont suffice, since the ro is dependent on L alone....
Added after 5 minutes:
I do not understand how increasing the (W/L) of the cascode transistors helps me in matching their Vgs.
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