Design Of A Low Noise Amplifier For 5-6GHz Applications

Nur Diyana , Ismail (2007) Design Of A Low Noise Amplifier For 5-6GHz Applications. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The following report presents the process done on the design simulation of a low noise amplifier. The purpose of the amplifier is to amplify the received RF path of a Wireless local area network (WLAN). The design methodology required the analysis of the transistor stability and proper matching network selection. The design of an LNA in Radio Frequency (RF) circuits requires the trade-off of many importance characteristics such as gain, noise figure (NF), stability, power consumption and complexity. This situation forces designers to make choices in the design of RF circuits. The design specifications for this amplifier were not very demanding (compared to the industry) due to the nature of it being a first time design. This was the main reason why the BFP640 NPN Silicon Germanium RF transistor (Infineon Technologies) was chosen over others due to the simplest configuration it offers for an amplifier design. Several measurement techniques using design tool Advanced Design System (ADS) for simulations where the noise circles and available gain circles are the tools that give the most guidance on the design tradeoffs, while FR4 strip board is used for fabrication purposed and the Network Analyzer for the practical testing of the amplifier were used to verify the performance of the designed amplifier.

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