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Engineering Notes

POWER RF AMPLIFIERS TECHNICAL REFERENCE MATERIAL

Intermodulation Distortion

Second Order (IMD2) Frequencies (2 tones)

F_IMD2 = F₁ + F₂ $ F₂ - F₁

Example:
F₁ = 5 MHz
F₂ = 8 MHz

F_IMD2 = 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.

Third Order (IMD3) Frequencies (2 tones)

F_IMD3 = 2F₁ - F₂ $ 2F₂ - F₁
Example:
F₁ = 7 MHz
F₂ = 8 MHz
F_IMD3 = 2F₁ - F₂ = 2(7) - 8 = 14 - 8 = 6 MHz and
2F₂ - F₁ = 2(8) - 7 = 16 - 7 = 9 MHz

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