Design Fabricate And Measurement Of Linear Power Amplifier For Communication Applications

Abd Majid , Darsano and Prof Madya Abdul Rani, Othman and Redzuan, Abdul Manap (2008) Design Fabricate And Measurement Of Linear Power Amplifier For Communication Applications. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Power amplifiers (PAs) are key components in wireless transceivers. The function of Power Amplifier (PA) is to amplify the signal and generate the required Radio Frequency (RF) power that allows transmission of the signal over the appropriate range. One of the problem on PAs is nonlinearity because the large signal behaviour of the semiconductor devices is nonlinear. Linear power amplifiers are needed in many modem wireless systems such as WiMAX that deploy non-constant envelope modulations. Therefore, this thesis presented design of a linear power amplifier for communication applications specifically for WiMAX application to overcome the nonlinearity in PAs. The suitable frequency for WiMAX application in Malaysia is 2.3GHz. The objective of this project is to design. Simulate and fabricate a power amplifier based on BJT transistor at 2.3GHz using Advance Design System (ADS) 2004 software. WiMAX. the Worldwide lnteroperability for Microwave Access, is a wireless digital communication system based on the IEEE 802.16 standard, which ensures compatibility and interoperability between broadband wireless access equipment. This project will use Bipolar Junction Transistor (BJT) which are usually of the npn type. and are often preferred because of higher gain and lower cost. By the end of this project. the linear power amplifier at frequency 2.3GHz will be constructed. With modern communication standards these power amplifier should be high ly linear with 15-20dBm power gain at I dB compression point, S21 > 15dB, S11 and S22 < -I OdB.

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