Improving the Measurements of IP3
Microwave and Optical Technology Letters
IP3 is an important parameter of RF amplifiers. It is available from the datasheet and calculated from the interception between the line of the output power at fundamental frequencies and that of the power of the 3rd-order intermodulation product conventionally measured from two-tone tests. However, the measured output power at fundamental frequency will be affected by 3rd-order intermodulation products. In this article, the impacts from 3rd-order intermodulation products to the fundamental tones are analyzed. As an analytic formula-based calibration solution, simple formulas that remove corresponding nonlinear effects are suggested.
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Yan, S., Yang, X., Li, X., & Li, F. Improving the measurements of IP3. Microwave and Optical Technology Letters.