harpoon wrote on Oct 10th, 2013, 3:41am:hi lvbq,
if you do manage to get to the bottom of it, it would be good to know what it was and how you fixed it ...
all the best !
Just from pre-simulation without mismatch model,I found that the Large CS transistor‘s size can down the SFDR .
I think the dynamic impendance of the cascode current source becoming very low in high frequency(in Nyquist frequency)。
Therefore,There is a tradoff of the size of the current source (Is that called the tradoff between Static and Dynamic performance?)
My English just so so...I'm not a native speaker..I don't know whether you can understand what i mean。