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Harmonic distortions in an ideal sine wave

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jiangxb

jiangxb

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hi

i use a ideal sine source in cadence to output a sine wave, and process it in matlab to plot it's psd, as below

this is a ideal sine wave, but there are the 3rd and 5th harmonic distortion. why?

(i use hanning window. if no window, the harmonic distortion exist yet)
 

Re: harmonic distortion

Hi

The harmonic distortion may be related to the way you are saving cadence results.
Please give more details, how are you saving cadence data for matlab processing?
 

    jiangxb

    jiangxb

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Re: harmonic distortion

there is no HD3 , HD5 if you use ideal sine wave in MATLAB,
the result u got probably come from some numerical , or truncation process.
 

    jiangxb

    jiangxb

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Re: harmonic distortion

hi analogy and Btrend
thank you

i have found the cause. i use ocnprint to output the data from cadence, and use the default precision, 6, so have truncation error. when i set precision 10, the result is correct.
 

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