Le Leivre.com

Spurious Free Dynamic Range Calculator

Calculate the SFDR for a communications system.
Enter the Noise Figure and input IP3 for the system.
Bandwidth is normalised to 1Hz (default) or any required.


IIP3
dBm


BW
Hz


NF
dB


Temperature
°C






MDS (SNR=1)


SFDR dB/Hz2/3



*Notes.
MDS (dBm) = 10 * Log10(k*T*BW) + 30 + NF
SFDR (dB) = 2/3 (IIP3 - MDS)

The MDS is shown for SNR=1 and therefore equal to the noise floor. True MDS should take into account the SNR required of the modulation/coding in use.