GRF2505 Linear PA Driver/Ultra-Low Noise Amplifier Guerrilla RF GRF2505 Linear PA Driver/Ultra-Low Noise Amplifier is a broadband, ultra-low noise, linear amplifier offering the highest performance levels. The Guerrilla RF GRF2505 is for demanding 802.11ac and wireless backhaul LNA and PA driver applications. This amplifier exhibits outstanding broadband NF, linearity, and return losses over 4.0 to 6.0GHz with a single match. It's operated from a single positive supply of 1.8V to 5.0V with a selectable Iddq range of 20 to 70mA for optimal efficiency and linearity.