GRF4042 Low Noise Amplifier with Bypass Guerrilla RF GRF4042 Low Noise Amplifier with Bypass and Guerrilla Armor™ is designed for high-performance applications up to 2.7GHz. Guerrilla Armor technology provides exceptional off-state isolation in the presence of high RF input signal levels in LNA disabled mode. The device achieves outstanding noise figure (NF), high gain, and high linearity over 400-2700MHz using as few as three external components with integrated matching. The Guerrilla RF GRF4042 LNA is operated from a single positive supply of 1.8V to 5.0V with a selectable Iddq range of 15mA to 90mA.