Characterizing Intermodulation Distortion of High-Power Devices

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  • Author: M. Ibrahim Khalil
Modern wireless communication systems demand for high power and broad-band devices. There are different technologies emerging offering more and more power density, with single devices deliv-ering power levels above 100 watts. These devices are targeted for broadband telecommunications like W-CDMA or Wi-Fi application. Intermodulation distor-tion is very critical in these applications because it generates crosstalk and requires costly linearization techniques. Therefore, it is necessary to characterize the devices for their linearity very accurately. A classical approach is to measure IP3. Because of the high power levels, however, this is not straightforward and requires a dedicated test setup. This is presented here, along with some tips and tricks to measure such devices.