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How to use spectre to run THD?

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tsinghua

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how to use spectre

I am designing an opamp used in 20bit codec. But I do not know to set the parameters correctly to get the right THD (Total Harmonic Distortion). The spec requres the THD<-90dB. But the THD function applied to the output of spectre can only get about -47dB even the waveform is the idel sinusoid generated by the sine source.
Can anyone give such a simulation deck in spectre netlist to show how to set parameters correctly for right THD?
 

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