Feature: RF


Figure 3: Simulation and measurement of AM-AM and AM-PM distortion


Figure 5 shows simulated results for a 2140MHz power sweep of a 0.25W driver amplifier ADL5320, when driven by a 5MHz- wide carrier. Te simulated carrier consists of eleven evenly-spaced subcarriers, and ACLR is measured at a 5MHz carrier offset.


Simulation suggests that the ACLR


reaches its optimum value at an input power of -15dBm, below which ACLR degrades dB for dB with the input level. This region of the plot is dominated by the noise figure data in the dataset.


As the input power increases above -15dBm, the ACLR degrades at a rate that closely correlates with the device’s IP3. It’s significant to note that the results of this simulation rely on both noise figure data (at low power) and


Figure 4: Simulated and measured power sweep at 3.2GHz of HMC1114, a 10W GaN amplifier


34 April 2022 www.electronicsworld.co.uk


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