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»
Gain (dB):   Output (dBm) :  
IIP3 (dBm):   OIP3 (dBm):  
IM3 (dBm) :   P1dB (dBm):  
   
 
» HD3 ↔ IM3, HD2 ↔ IM2

 
For nonlinear system " Input → → Output ",
 
1). HD (Harmonic Distortion)
Input = A•cos(ω)t
 
then
Output = a0 + a1•cos(ω)t + a2•cos(2ω)t + a3•cos(3ω)t + a4•cos(4ω)t + …
 
define:
HD3 = a3/a1
HD2 = a2/a1
 
2). IM (InterModulation distortion)
Input = A•cos(ω1)t + A•cos(ω2)t
 
then
Output = b0 + b1•cos(ω1,2)t + b2•cos(ω1±ω2)t + b3•cos(2ω1±ω2)t + …
 
define:
IM3 = b3/b1
IM2 = b2/b1

  Thus,
HD3 : IM3 :  
HD2 : IM2 :