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wide swing cascode current mirror

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zackYz

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-How could we maximize output resistance(more than 5M) in a wide cascode current mirror with maintaining current mirroring accuracy(error less than 2%)?
(Q4and Q3, Q1 and Q2 must be matched)
-In addition, How could different W and L value in Q4 and Q1 change Rout value?
 

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