Design and Optimization of a New LNA

  • Mojtaba Behzad Fallahpour Malek e Ashtar University of Technology


In this paper a new LNA with image rejection filter is presented. Furthermore, after determining topology, a proposed CAD (Computer Aided Design) with a proposed multi objective genetic algorithm will be used to optimize the LNA. By performing the algorithm, several results will be obtained as they have no priority to each other, so the designer can select each of them according to his need. Simulation results show that the proposed plan weakens the image considerably; it also increases LNA gain without changing the noise figure (NF), output matching and input matching. The proposed multi objective genetic algorithm program is written by MATLAB and the circuit simulated by HspiceRF with 0.18μ technology.


[1] G. A. Golmakani, K. Mafinejad, A. Kouzani,” Design and Optimization of LNA Topologies with Image Rejection Filters”, International Journal of RF and Microwave Computer-Aided Engineering vol. 20, no. 3, pp.289-297, May 2010.
[2] C.-Y. cha, S.-G. Lee, "A 5.2 GHz LNA in 0.35 μm CMOS utilizing inter-stage series response and optimizing the substrate resistance”, IEEE j. Solid-Stage Circuits, vol. 38, no.4, pp.. 669-672, April 2003.
[3] B. Razavi, RF Microelectronics, Prentics-Hall,Upper Saddle River , 1997.
[4] D. Leenaerts, G. Gielen, and R.A. Rutenbar, CAD solutionsand outstanding challenges for mixed-signal and RF ICdesign, Proceedings of the IEEE Conference on Computer-Aided Design, San-Jose, California, 2001, 270–277.
[5] E. Kargarn, H. Khosrowjerdi, K.Ghaffarzadegan and H. Nabovati, "A 5.7 GHz low noise figure ultra high gain CMOS LNA with inter stage technique", IEICE Electronics Express, Vol. 7, no.23,1686-1693.
[6] J.S . Walling, S .Shekhar, and D.J.Allstot, “A gm-Boosted Current-Reuse LNA in 0.18 μm CMOS”, IEEE radio FREQ. Inter.Circuits Symp.,pp . 613-616 ,3-5 June 2007.
[7] Y.S. Wang, L. H. Lu, "5.7 GHz low-power variable-gain LNA in 0.18 μm CMOS", Electron. Lett., vol. 41, pp. 66-68, 2005.
[8] C.-H. Liao, H. R.Chuang, “A 5.7GHz 0.18μm CMOSgain-controlled differential LNA with current reuse for WLAN receiver”, IEEE Microw.Wireless Compon. Lett., vol.13, no.12, pp.526-528, Dec. 2003 .
[9] Choong-Yul Cha and Sang-Gug Lee, “5.2-GHz LNA in 0.35μ CMOS Utilizing Inter-Stage Series Resonance and Optimizing the Substrate Resistance,” IEEE Journal of Solid-state Circuits, vol. 38, no. 4, pp.669-672,April 2003.
[10] A.jafari , M.zekri , S.sadri , A.R.mallahzadeh," Design of Analog Integrated circuits by using genetic algorithm" , in IEEE Second International Conference on Computer Engineering and Applications (ICCEA) , pp. 578-581, 2010.
[11] M. Taherzadeh, R. Lotfi, H. Zare and O. Shoaei, "Design optimization of analog integrated circuits using simulation-based genetic algorithm", Proc. IEEE International Symposium on signals and circuits, Vol. 1, pp. 73-76, July 2003.
[12] E. Zitzler, Evolutionary Algorithms for Multiobjective Optimization: Methods and Applications, PhD thesis, Swiss Federal Institute of Technology, Zurich, Switzerland, 1999.
[13] El-Sayed M. El-Alfy, “Flow-Based Path Selection for Internet Traffic Engineering with NSGA-II,” IEEE 17th Internation conferece on Telecommunications, pp. 621 – 627, 2009.
[14] K. Deb, A. Pratap et al, “A fast and elitist multi-objective genetic Algorithm: NSGA-II,” IEEE Trans. On Evolutionary Computation, Vol. 6, no.2, pp.182-197, 2002.
[15] S.Babayan Mashhadi, "Optimizing the Design of Low-voltage and Low- Power Analog Integrated Circuits using Multi-objective Genetic algorithms", A dissertation submitted in partial fulfillment of the requirements For the degree of Master of Science in Electrical Engineering In the graduate division Of the Ferdowsi University of Mashhad.
How to Cite
Behzad Fallahpour, M. (2013). Design and Optimization of a New LNA. Majlesi Journal of Telecommunication Devices, 1(3). Retrieved from