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RTU1A-5

RTU1A-5. A 25 GHz 3.3 dB NF Low Noise Amplifier based upon Slow Wave Transmission Lines and the 0.18 μm CMOS Technology. A. Sayag (1) , S. Levin (2) , D. Regev (2) , D. Zfira (2) , S. Shapira (2) , D. Goren (3) and D. Ritter (1)

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RTU1A-5

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  1. RTU1A-5 A 25 GHz 3.3 dB NF Low Noise Amplifier based upon Slow Wave Transmission Lines and the 0.18 μm CMOS Technology A. Sayag(1), S. Levin(2), D. Regev(2), D. Zfira(2), S. Shapira(2), D. Goren(3) and D. Ritter(1) (1) Department of Electrical Engineering, Technion, Haifa, Israel(2) Tower Semiconductors inc., Migdal HaEmek, Israel(3) IBM Haifa Research Laboratories, Haifa, Israel RFIC – Atlanta June 15-17, 2008

  2. Outline • Low Noise Amplifier design methodology • New semi-analytic model for slow wave transmission lines • LNA performance RFIC – Atlanta June 15-17, 2008

  3. Motivation • Can we get close to the transistor minimum NF in 24GHz LNA design? @ 24GHz Best 0.18 μm 24 GHz LNA: NF=3.9 [Shih-Chieh Shin et al., IEEE MWCL, 2005.] RFIC – Atlanta June 15-17, 2008

  4. LNA Design Methodology • Determine the optimal current density • Determine critical circuit element values • Choose the transistor width RFIC – Atlanta June 15-17, 2008

  5. Transistor Performance Determined by Current Density @ 24GHz @ 24GHz @ 24GHz RFIC – Atlanta June 15-17, 2008

  6. Transistor Performance Determined by Current Density RFIC – Atlanta June 15-17, 2008

  7. Circuit Topology: Common source with inductive source degeneration RFIC – Atlanta June 15-17, 2008

  8. Source Inductor value for each Width RFIC – Atlanta June 15-17, 2008

  9. Example: Source Inductor for W=40μm RFIC – Atlanta June 15-17, 2008

  10. How does the Insertion Loss of the Input Matching Network Depend on Transistor Width? • Equal Insertion loss contours • Each point on the Smith Chart corresponds to a hypothetical transistor input impedance • Input impedance is matched to 50 ohms by a matching network with inductors having Q=20 RFIC – Atlanta June 15-17, 2008

  11. Insertion Loss Map of the Input Matching Network with Q = 10 RFIC – Atlanta June 15-17, 2008

  12. Insertion Loss Map of the Input Matching Network with Q = 30 RFIC – Atlanta June 15-17, 2008

  13. We need Q > 20 ! RFIC – Atlanta June 15-17, 2008

  14. Choosing the Transistor Widths(assuming a two identical stage amplifier) * gS - normalized source gain factor RFIC – Atlanta June 15-17, 2008

  15. Choosing the Transistor Widths (assuming a two identical stage amplifier) RFIC – Atlanta June 15-17, 2008

  16. High Q Slow Wave Transmission Lines • Effective dielectric constant larger than that of the surrounding dielectric material • The effective dielectric constant determined by geometry RFIC – Atlanta June 15-17, 2008

  17. Properties of Slow Wave TL • Isolation from the lossy silicon substrate • Shorter wavelength  shorter matching networks • Lower loss per wave length higher Q of resonators • Smaller die area • Higher characteristic impedance • Complicated EM simulations • Complicated layout RFIC – Atlanta June 15-17, 2008

  18. Measured and Simulated Slow Wave Transmission Line Parameters twice the effective dielectric cons. of SiO2 RFIC – Atlanta June 15-17, 2008

  19. Properties of Slow Wave Transmission Line RFIC – Atlanta June 15-17, 2008

  20. Our Compact Analytic RLCG Model of Slow Wave Transmission Lines *A. Sayag et al., submitted to TMTT RFIC – Atlanta June 15-17, 2008

  21. Using our Compact Model to predict Slow wave TL performance RFIC – Atlanta June 15-17, 2008

  22. Low Noise Amplifier • All the matching networks are slow wave transmission lines RFIC – Atlanta June 15-17, 2008

  23. Measured and Simulated Performance RFIC – Atlanta June 15-17, 2008

  24. Simulated Noise Contributions • Transistors: 70% • Transmissions lines: 23% • Capacitor parasitics: 7% RFIC – Atlanta June 15-17, 2008

  25. Comparison with State of the Art LNAs [1] Shih-ChiehShin et al., IEEE Microwave and Wireless Component Letters, July, 2005. [2] E. Adabi et al., " RFIC Symposium, June 3-5, 2007, Honolulu, Hawaii. RFIC – Atlanta June 15-17, 2008

  26. Conclusions • LNA design methodology presented. • New analytic model of slow wave transmission lines. • Record 2.8dB NF @ 24 GHz obtained using 0.18 μm technology. • Slow wave transmission lines contributed only 23% of the total noise. • Lower NF should be achieved using more advanced technologies RFIC – Atlanta June 15-17, 2008

  27. Thank You! RFIC – Atlanta June 15-17, 2008

  28. Testing our model: Comparison between Slow Wave Transmission Line and Grounded Coplanar Waveguide Grounded coplanar Slow wave RFIC – Atlanta June 15-17, 2008

  29. Comparison of Slow Wave and Grounded Coplanar Waveguide RFIC – Atlanta June 15-17, 2008

  30. Comparison between Slow Wave Transmission Line and Coplanar Waveguide Coplanar Waveguide slow wave RFIC – Atlanta June 15-17, 2008

  31. Comparison between Slow Wave and Coplanar Waveguide RFIC – Atlanta June 15-17, 2008

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