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Spurious Free Dynamic Range
 
The spurious-free dynamic range is the range (defined at the input of the amplifier) from the noise floor or Minimum Detectable Signal (MDS) level to the input level at which spurious products begin to emerge from the noise floor at the output of the amplifier.

These spurious products may be either two-tone intermodulation products or single-tone harmonic products. Intermodulation products arise when two simultaneous signals are applied to the amplifier input and mix due to nonlinearities, creating intermodulation products at the amplifier output. Single-tone spurious products occur when only a single fundamental frequency is present at the input of the amplifier. Initially single tone spurious products will only consist of harmonic integer multiples of the fundamental frequency, but, when these harmonics achieve sufficient amplitude they begin generating intermodulation products with the fundamental and eventually with themselves. The spurious-free dynamic range can be calculated from the amplifier's intercept point, gain, and MDS level, using the equation

DRf = 2/3[IP - G - MDS]

where DRf is the spurious free dynamic range (in dB)
IP is the third order intercept point (in dBm)
G is the gain of the amplifier (in dB)
MDS is the Minimum Detectable Signal at the input of the amplifier

MDS can be calculated from the Equation

MDS = kTB + BW + 3dB + NF

where kTB is the thermal noise level in a 1 MHz bandwidth (-114 dBm)
BW is the amplifier bandwidth (in dB relative to a 1 MHz bandwidth)
NF is the amplifier noise figure (in dB)

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this page last updated: 1 October 1999