Design Of Low Noise Amplifier For WiMax Application

Mohamad Harris, Misran (2011) Design Of Low Noise Amplifier For WiMax Application. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Termed as the new era in wireless communications, WiMAX is the answer to anytime, anywhere access to information, offering reliable Internet connectivity all around the world. In the receiver part of WiMAX system, the most important device is the Low Noise Amplifier (LNA) which is located at the front-end of the receiver.The LNA main function is to provide the first signal of amplification and reduce the noise in the received signal. Without the LNA the signal that enters the system will be very weak and fill with noise. This will make it harder for the system to read the signal. There are two types of frequency band for WiMAX system which are the licensed and unlicensed band. In the licensed band, there are three frequency spectrum allocated which are 2.3 GHz, 2.5 GHz and 3.5 GHz. The project objective is to design a LNA using frequency 3.3 GHz to 3.8 GHz and the noise figure targeted are less than 2 dB and gain is larger than 10 dB. Transistor ATF-54143 Low Noise Enhancement Mode Pseudomorphic HEMT from Avago Technology will be used to design the LNA because it meet the specifications and recommended by Avago Technology to designs LNA for WiMAX application. The simulation for this project will be using A WR Microwave Office and starting from scratch the LNA will be design from 2-port network transistor, input and output matching and DC biasing to design a single stage LNA. Two technique of Broadband Amplifier design which is the Feedback Amplifier (FA) and Balance Amplifier (BA) will be design and simulate to find the best technique. The best technique is the Feedback Amplifier which gives nominal noise figure of 1.02 dB and gain of 12 dB.

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