Design and Optimization of an Ultra Wideband LNA-Antenna

In this paper, we proposed a low noise amplifier (LNA) for ultra wideband (UWB) applications using TSMC ۰.۱۸µm CMOS technology. LNA and high frequency H-shaped antenna have been utilized to solve problems of each block, such as the necessity of being matched with ۵۰ Ohm impedance, so we have one more degree of freedom and a more complex system, although our choosing ability is increased.The targeted is Ultra Wide Band where this architecture and a Co-Designed version, with UWB-LNA architecture offer one of the best compromises between gain and noise figure.For having the best trade-offs between these two cases in UWB-LNA, both Multi-Objective Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) are used successfully. Symmetric nature is obtained both in terms of S-parameter as well as flatness over a wide bandwidth for gain and noise figure.To have better Co-Design; in this work another optimization on antenna parameters performed with ADS Software.In co-optimization with the aid of two techniques; LNA parameters improvement utilizing evolutionary algorithms and antenna parameters enhancement in co-design output S-parameters had more promising results.Results show gain-flatness is being enhanced in desired frequency band. Noise factor is improved by more۱.۵ dB over the whole bandwidth [۳.۱GHz-۸.۱GHz]and supply voltage of ۱.۸V.

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