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Engineering Notes


RF POWER AMPLIFIERS TECHNICAL REFERENCE MATERIAL


Intermodulation Distortion


Second Order (IMD2) Frequencies (2 tones)

FIMD2 = F1 + F2 $ F2 - F1

Example:

F1 = 5 MHz
F2 = 8 MHz
FIMD2 = F1 + F2 = 8 + 5 = 13 MHz and
F2 - F1 = 8 - 5 = 3 MHz

Second order IMD is out of band for HPA's with a bandwidth less than one octave.

rf amplifiers intermodulation  dist
Third Order (IMD3) Frequencies (2 tones)

FIMD3 = 2F1 - F2 $ 2F2 - F1

Example:

F1 = 7 MHz
F2 = 8 MHz

FIMD3 = 2F1 - F2 = 2(7) - 8 = 14 - 8 = 6 MHz and
2F2 - F1 = 2(8) - 7 = 16 - 7 = 9 MHz

Third Order (IMD 3) Frequencies (2 tones)