Geoffrey_Coram
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If you vary the width, then the mismatch in current will be approximately linear, because the current goes to first order as W/L*beta*f(Vgs, Vds).
If you are operating in the linear region, then I guess this might be OK, since a variation in threshold voltage will also be linear. But then again, variation in length will cause an 1/x variation in current. And, if you are in subthreshold, you're completely toast, because a threshold voltage mismatch will cause an exponential mismatch in current.
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