A novel MMIC PHEMT low noise amplifier for GPS applications

A monolithic two-stage pseudomorphic high-electron-mobility transistor (PHEMT) low-noise amplifier (LNA) has been developed for the Global Positioning System (GPS) and spread spectrum bands covering 0.5 to 3.0 GHz. This amplifier uses Avantek's PHEMT devices with sub-0.2- mu m gate lengths and 0.25-dB noise figures in this band. The amplifier is unique in its use of a source follower second stage, resistive feedback, and on-chip matching. Gain of 15 dB and a noise figure of 1.7 dB have been measured. Designed to fit into a plastic 86 or SOT-143 surface mount package, the die is small, draws low current, utilizes low voltage, and has no bias choke requirement.<>