Paul
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Hello Logan,
you have to consider several aspects and decide which are most important to your design.
a) flicker noise is lower for wider W*L, i.e. function of 1/(W*L) b) matching is proportional to 1/(W*L), but for very narrow or very short devices also to 1/W+1/L c) with very short channels, you can experience velocity saturation, degrading the transconductance and increasing the channel thermal noise coefficient
I don't know if this fully answers your question...
Paul
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