Nov 19, 2010 #1 W whlinfei Member level 2 Joined Dec 31, 2008 Messages 48 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,286 Activity points 1,658 Hi all, I am trying to use DFT to get the THD of my design. But somehow the output waveform give only a input frequency component and some of its harmonics with the same magnitude. ( I used Hspice to verify that the DFT result should not be like that.) can anyone tell me how to fix it ? Thanks. Best Regards, whlinfei
Hi all, I am trying to use DFT to get the THD of my design. But somehow the output waveform give only a input frequency component and some of its harmonics with the same magnitude. ( I used Hspice to verify that the DFT result should not be like that.) can anyone tell me how to fix it ? Thanks. Best Regards, whlinfei
Nov 19, 2010 #2 J JoannesPaulus Advanced Member level 3 Joined Mar 19, 2008 Messages 773 Helped 235 Reputation 470 Reaction score 138 Trophy points 1,323 Location USA Activity points 5,006 A picture is worth a thousand words! Could you show your DFT plot and its parameters?