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IP3 Calculator
Calculate output IP3, input IP3, IM3 product level, and input power from two-tone output power, IM3 suppression, and gain.
Input Parameters
Results
Use equal tone levels when applying the standard OIP3 = Pout + IMD/2 relation.
Equations Used
Output IP3:
OIP3 = Pout + IMD/2
Input IP3:
IIP3 = OIP3 - gain
IM3 Product Level:
PIM3 = Pout - IMD
Input Power:
Pin = Pout - gain
Frequently Asked Questions (FAQ)
Q1: What is IP3?
IP3 is the theoretical intercept point where fundamental and third-order distortion lines meet in a two-tone test.
Q2: What is the difference between OIP3 and IIP3?
OIP3 is referenced to output power. IIP3 is referenced to input power and is OIP3 minus gain.
Q3: What is IM3 suppression?
It is the difference in dB between the fundamental tone and third-order intermodulation product.
Q4: Can IP3 predict compression?
No. IP3 describes small-signal nonlinearity. Compression and saturation require separate device data.
Q5: Why is IP3 important in RF receivers?
Higher IP3 means better tolerance to strong blockers and lower intermodulation distortion.
Q6: Is this valid for unequal tones?
This simple calculation assumes equal two-tone powers and third-order behavior.
