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THD Comparision of Folded- and Telesopic OTA based filter

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karakurto

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thd +ota

Hi,

I designed two Gm-C low-pass biquad filters by using only folded-cascode and telescopic-cascode OTAs for the each biquad.
THD of the telescopic-cascode based filter is much much more than of folded-cascode based filter.
I was expecting telescopic-based would have less THD!
I wonder if my expectation is wrong or my circuits! OTAs work fine.
What would you expect? Which filter should normally have less THD???? Whose THD is normally lower: telescopic or folded OTA?
Thanks
 

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