help on THD of the Capacitive Reset Gain Circuit

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allennlowaton

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Good day EDA fellows,

I badly needed your help regarding this one.
Below is the capacitive-reset gain circuit.


This is also the frequency response of my op-amp.


Shown below are the THD simulation results;



My concerns now are these: a) why the THD values for inputs at 1k and 100k are so big?
b) why the THD values for these input conditions (10k at 1MHz clock, 1k at 100k clock) are significantly lower?
 

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