  One of the major challenges in communication, radar, and electronic warfare
receivers arises from nearby device interference. The paper presents a 2-6 GHz
GaN LNA front-end with onboard sensing, processing, and feedback utilizing
microcontroller-based controls to achieve adaptation to a variety of
interference scenarios through power and linearity regulations. The utilization
of 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 power
consumption to tune from 500 mW to 2 W (4X increase) in order to adjust the
linearity 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 (1
W) to achieve an adaptation time <1 ms.
