How do I find the Spurious Free Dynamic Range (SFDR) for an SDG function generator?

May 21, 2021

If the SFDR is not listed directly in the specifications, you can find it by selecting the largest value between the harmonic and non-harmonic spurious data from the specification sheet at the frequency of interest.

For example, here is the SDG6X generator specs for harmonic and non-harmonic distortion:

SDG6000 SFDR specification


If the signal of interest was 500 kHz, then the Non-Harmonic spur spec of – 60dBc (which is the worst) would be the reported SFDR.

If the signal was 100 MHz, then it would be the harmonic distortion spec of -50dBc, which is the worst.