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Dyanmic Range from DFT in Cadence

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richaphy

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I have done DFT in cadence for my low pass filter.
1) Does the difference between first and third harmonic gives a rough estimate of the dynamic range of the filter?
2) Should the dynamic range change with change in input amplitude? (I think yes and in y case it is changing)
3) I have also done thd, but thd is not changing while dft plot are changing with change in input amplitude.
Please help to understand this.
Thanks
 

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