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I agree the current is mainly determined by bottom transistor. However, since the drain of bottom transistor is shielded by the cascode transistor, actually there should only be very small Vds change of the bottom transistor. That's why I thought it is ok to use small length for bottom transistor.
I am designing a typical cascode high swing NMOS current mirror. Trying to determine on the transistor size here. In my opinion, the bottom transistor can be minimum length because its Vds doesn't change much due to the buffer of cascode transistor above, while the cascode transistor should use...
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