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A GaAs pHEMT MMIC amplifier incorporating an integral bypass switch helps improve the performance of WiMAX receivers over variable transmission paths.

WiMAX is a form of broadband wireless access (BWA) that is based on the IEEE 802.16 standard for wireless Metropolitan Area Networks (wireless MANs). It can be used for a variety of applications including a "last-mile" broadband connection, hotspot and cellular backhaul, and high-speed enterprise connectivity for businesses.

One fixed version of WiMAX, IEEE 802.16d provides non-line-of-sight (NLOS) transmission to stationary devices using 2 to 11 GHz frequencies over distances in the approximately 4 to 6 mile range. The mobile version of the standard, 802.16e, is an extension of 802.16d for mobile use in the 2-6 GHz band. It allows WiMAX technology to be built into notebook computers and other mobile devices. These NLOS and mobile applications, in which received signal levels can vary over an extremely wide range, call for receivers combining low-noise figure for sensitivity with wide dynamic range to assure reliable service at data rates that users/subscribers anticipate.