venki_vlsi
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Posts: 29
warangal
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hi, i calculated my THD by keeping a fourier component at output. Conditions : FIn=10.1318MHz,FS=125Mhz,Cycles=83,Samples=1024. I have plotted 512 hormonics by giving normhorm=83,hormonics=512,Fund=122.07Khz and found THD=57db. In that 512 hormonics i taken out 5 hormonics (83,83*2,83*3,83*4,83*5)and calculated THD=63.15db. now my doubt is whether these 512 hormonics includes THD+transient noise+thermal noise,or its only THD(hormonic components). If it is THD+noise,is it equal to SNDR of DAC. SNDR=S/N+THD. Most of papers are specifying only 1st ,2nd 3rd,4th,and 5th hormonic output as THD but here we r including all frequencies till Fs/2.That the reason i got this doubt
Regards venkats
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