i am testing DAC using the discrete data obtained from HSPICE simulation. Data frequency is (15/32)*50M and sampling frequency is 50MHz.
However I found that even the data is got from ideal DAC , the FFT plot is not satisfying in matlab with only about 20dB SFDR.
Anyone can tell what is the problem ?
Even with more data points, the situation is the same.
I am using a perl script to generate the ideal DAC output , I am wondering whether the perl script does not have enough accuracy.