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One of the major challenges in communication, radar, and electronic warfarereceivers arises from nearby device interference. The paper presents a 2-6 GHzGaN LNA front-end with onboard sensing, processing, and feedback utilizingmicrocontroller-based controls to achieve adaptation to a variety ofinterference scenarios through power and linearity regulations. The utilizationof GaN LNA provides high power handling capability (30 dBm) and high linearity(OIP3= 30 dBm) for radar and EW applications. The system permits an LNA powerconsumption to tune from 500 mW to 2 W (4X increase) in order to adjust thelinearity from P\textsubscript{1dB,IN}=-10.5 dBm to 0.5 dBm (>10X increase).Across the tuning range, the noise figure increases by approximately 0.4 dB.Feedback control methods are presented with backgrounds from control theory.The rest of the controls consume $\leq$10$\%$ (100 mW) of nominal LNA power (1W) to achieve an adaptation time <1 ms.

Sub-1ms Instinctual Interference Adaptive GaN LNA Front-End with Power and Linearity Tuning