Precise Characterization and Multiobjective Optimization of Low Noise Amplifiers
| Autor: | Jakub Kakona, David Cerny, F. Vejrazka, Jan Michal, Martin Grabner, Josef Dobes, Jakub Popp, Stepan Matejka |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
noise figure
Engineering goal attainment method RF front end business.industry Preamplifier Amplifier Noise figure Low-noise amplifier Multi-objective optimization Pareto front Low noise amplifier Noise pHEMT transducer power gain Electronic engineering CAD multiobjective optimization Markowitz criterion lcsh:Electrical engineering. Electronics. Nuclear engineering Electrical and Electronic Engineering business Metaheuristic lcsh:TK1-9971 |
| Zdroj: | Radioengineering, Vol 24, Iss 3, Pp 670-680 (2015) Radioengineering. 2015 vol. 24, č. 3, s. 670-680. ISSN 1210-2512 |
| ISSN: | 1210-2512 |
| Popis: | Although practically all function blocks of the satellite navigation receivers are realized using the CMOS digital integrated circuits, it is appropriate to create a sepa- rate low noise antenna preamplifier based on a low noise pHEMT. Such an RF front end can be strongly optimized to attain a suitable tradeoff between the noise figure and trans- ducer power gain. Further, as all the four principal naviga- tion systems (GPS, GLONASS, Galileo, and COMPASS) work in similar frequency bands (roughly from 1.1 to 1.7 GHz), it is reasonable to create the low noise preamplifier for all of them. In the paper, a sophisticated method of the amplifier design is suggested based on multiobjective optimization. A substan- tial improvement of a standard optimization method is also outlined to satisfy a uniform coverage of Pareto front. More- over, for enhancing efficiency of many times repeated solu- tions of large linear systems during the optimization, a new modification of the Markowitz criterion is suggested compati- ble with fast modes of the LU factorization. Extraordinary attention was also given to the accuracy of modeling. First, an extraction of pHEMT model parameters was performed including its noise part, and several models were compared. The extraction was carried out by an original identification procedure based on a combination of metaheuristic and di- rect methods. Second, the equations of the passive elements (including transmission lines and T-splitters) were carefully defined using frequency dispersion of their parameters as Q, ESR, etc. Third, an optimal selection of the operating point and essential passive elements was performed using the im- proved optimization method. Finally, the s-parameters and noise figure of the amplifier were measured, and stability and third-order intermodulation products were also checked. |
| Databáze: | OpenAIRE |
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