Cascaded input IP3 calculation - F6CSX

Use the linear terms for IP3 and Gain in the above equations, not the decibel form, ie.: IP3. 2. Gain. 2. IP3. 1. Gain. 1. IP3. 3. Gain. 3. IP. TOT. 1. 1. IP3. 1. -----------.
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IP31 Gain1

IP32 Gain2

IP33 Gain3

The cascaded IP3 for the above is calculated using the equation

1 IP TOT = ---------------------------------------------------------------------------------------Gain Gain1 ⋅ Gain2 1 ----------- + --------------1- + ----------------------------------+… IP3 3 IP3 1 IP32 Use the linear terms for IP3 and Gain in the above equations, not the decibel form, ie.:

Gain n = 10

IP3 n ( dB ) ----------------------10

13 TECHNICAL NOTES AND ARTICLES

IP3n = 10

Gain n ( dB ) -------------------------10

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