[Modulator SNDR curve] measure every SNDR until SNDR equal to zero?

[boki]

Dear All,

If I want to measure modulator SNDR curve, I have to input every
different input power( log(input/vref) and get their SNDR until SNDR
is zero, than draw it as SNDR curve right? and that is my finally
dynamic range?

Is any quick method to get dynamic range directly from one SNDR value?

Thank you very much!

Boki.