Design Power Amplifier For GPS Application

Suriani, Md Nayan (2011) Design Power Amplifier For GPS Application. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This thesis is analyzing the Power Amplifier for GPS Application. The power amplifier is in the transmitting chain of the GPS system. They are the final amplification stage before the signal is transmitted. Its must produced enough output power to overcome channel losses between the transmitter and receiver signal gain. The ultimate goal is to design a Power Amplifier which covers range of GPS L1 frequency at 1.575 GHz. The design will focus on designing of matching network base on three difference types of matching network which is single stub element, quarter-wave element and lumped element. Matching is important because to maximize power delivery and minimize power loss and to improve signal to noise ratio as in sensitive components. This power amplifier design is to achieve high power output, gain, noise figure, and insertion loss through the GPS frequency range. The stability analysis of power amplifier is one of the most critical and the most challenging aspects of power amplifier design. This work shows an analysis technique, which accurately predicts the oscillations in power amplifier. Using the technique, different matching techniques and circuits are design and implementation. The transistor was choosing is NPN Bipolar power transistor (AT-41533). The frequency for AT-41533 power transistor is up to 5 GHz. The power amplifier is design based on simulation using AWR Software and the output gain is 15.921 dB using single stub element, 15.13 dB by using quarter wave element and 14.953 dB by using lumped element. From the analysis, we know that single stub element is the good impedance matching because it can fulfill the requirement parameter of the GPS application.

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