solidstate
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Munich, Germany
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To answer some questions in your first paragraph: first of all, the current mirror should be as long as possible, to make the effect of channel length modulation as small as possible to begin with. If you then use a cascode transistor on top of the mirror, you reduce the voltage swing at the drain by the voltage gain of the cascode, further reducing this error. If the error is still too big in this way (or if you want to widen your design space for the L of the current mirror), you can gain-boost that cascode, further fixing the drain voltage of the mirror.
If untreated, this effect is not noise, but nonlinearity. I'm not sure what you are referring to in the second paragraph.
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