Spurious Free Dynamic Range Calculator

Any RF receiver's capacity to function within noise and interference constraints is measured by SFDR. The SFDR value of any RF receiver can be calculated by using this calculator, just by filling the 3rd order intercept and minimum detectable signal in the spectrum.


  • Spurious Free Dynamic Range (SFDR)

What is spurious-free dynamic range?

In a radio receiver application, the Spurious-Free Dynamic Range (SFDR) is commonly used in a radio receiver to determine the input power range in which the received signal can be detected in the presence of noise and amplified without nonlinear disturbance.

 In a gain compression curve of a radio receiver, the SFDR is the area between the minimum detectable signal level and the point where the third-order product (noise) exceeds the minimum detection level. Usually, SFDR is measured in dBc (i.e., with reference to the carrier signal amplitude).

Gain compression curve

How to calculate spurious-free dynamic range (SFDR)?

The following formula is used to calculate the Spurious-Free Dynamic Range (SFDR) of a radio receiver.


SFDR = Spurious Free Dynamic Range in dB

IIP3 = Third Order Intercept Point in dBm/Watts

MDS = Minimum Detectable Signal in dBm

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