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۱Improvement of Ultra–Wideband LNA Parameters; Multi–Objective Algorithm for Flatness Over Bandwidth Less 3dB
اطلاعات انتشار: بیستمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۶
In this paper, we proposed a low noise amplifier (LNA) for ultra wideband (UWB) applications using TSMC 0.18μm CMOS technology. Our design consists of two simplestages with a connected resistive feedback. The first stage utilizes self degeneration techniques and cascade structure to obtain a wide band input matching and low noise figure. Acommon source amplifier with resistive feedback technique as the two stage achieves high flat gain. Having a gain–flatnessover the entire frequency range is one challenge in UWB Circuits. On The other hand, having a high gain, low noisefigure, input and output matching for all frequency bands are significant for the designer. For having the best trade–offs between these two cases, bothgenetic and Multi–Objective PSO optimization techniques are used. Proposed optimization application of Multi–Objective Algorithm has been successfully applied to LNA, optimizationvariable and compare with other reasearch. Symmetric nature is obtained both in terms of S– parameter as well as flatnessover a wide bandwidth for of the gain and noise figure. These results are compared with other optimization techniques such as Genetic Algorithm (GA) and Particle Swarm Optimization (PSO). This algorithm provides: gain more than 15dB, low noise figure (lower than 3.5dB) over a wide bandwidth (lessthan 3 dB), more reverse isolation than <−45 dB and better input\output matching within a supply voltage of 1.8V<\div>
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