I designed a 6-bit current-mode R2R DAC in LTSpice. This is the output spectrum with a 500kHz input sinusoid to an ideal ADC (running at 10MHz clock) which feeds directly into the DAC. Vin is input to ADC, Vout is output of DAC
I have a few questions about this:
- How do I determine the SNR and SNDR of this? Usually when I use Cadence Virtuoso for this kind of stuff, it gives me that output.
- Secondly, does my FFT spectrum seem okay? I know there is a lot of posts about LTSpice putting junk at the end of the FFT. I have tried my best to follow all the tips given by others on how to reduce it. (plotwinsize, etc.)