High Performance Lumped Component Wilkinson Power Combiner Distributed Amplifier Design
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Date
2009-12
Authors
Sangaran, Pragash
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The development of broadband power amplifier is critical for future radio technology. Conventional broadband power amplifier has gain-bandwidth product limitation based on transistor used. Distributed amplifier (DA) overcomes this limitation by combining output power from several transistors in additive fashion. However, conventional distributed amplifier has limitation in bandwidth as well. Adding devices beyond optimum number will increase gate and drain line attenuation and will degrade the power performance. Moreover, conventional distributed amplifier also exhibits low power and efficiency due to the drain line reverse wave. In this project, lumped component Wilkinson power combiner and splitter is used at the input and output of the distributed amplifier respectively to increase the bandwidth, efficiency and output power of a distributed amplifier. A lumped component Wilkinson combiner distributed amplifier and a conventional distributed amplifier have been designed. The measured performance of this novel lumped component Wilkinson combiner distributed amplifier had been compared with the conventional distributed amplifier using the same number of devices, layout and dc supply. These amplifiers have frequency range from 100 MHz up to 610 MHz and from 100 MHz to 520 MHz with output power of 26.25 dBm to 29.56 dBm and 24.11 dBm to 28.51 dBm respectively. PAE of LC Wilkinson combiner DA is varies from 26.2 % to 36 % whereas PAE of conventional DA is varies from 20.5 % to 26.5 %. The amplifier had been fabricated on a 14-mil thick printed circuit board (PCB) with a dielectric constant of 4.5. Measured results of the fabricated board have been found to be comparable to simulation results.
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Keywords
High Performance Lumped Component , Wilkinson Power Combiner Distributed Amplifier Design