Design and Analysis of a GaAs pHEMT Low Noise Amplifier for Multistandard Receivers Operating at 3.5 GHz

Abstract

An innovative design and analysis of a single-stage LNA for multi-standard receivers that work in the 3.5 GHz frequency range is presented in this paper. It is being designed for WiMAX. The ATF-34143 is a GaAs PHEMT transistor, and the purpose of this design is to achieve the best possible gain and noise performance from this type of transistor. The input matching network will use conjugate matching methods with ladder LC networks; due to the output impedance characteristics of the device, output matching will be done inherently by the device. The Advanced Design System (ADS) will be used to perform the simulations, optimizations and analysis. The LNA will have a measured gain of 13.57 dB and an NF measurement of 0.652 dB, which comply with the high-performance criteria set forth by present wireless communication systems.