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Senior Project 2008

Senior Project 2008. Ultra Wideband Amplifier Sarah Kief Saif Anwar Advisor: Dr. Shastry Bradley University Electrical Engineering. Outline. UWB overview Project Description Design procedures Lumped element Design M-derive Design Layout Microstrip Design Coplanar Wave Guide Design

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Senior Project 2008

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  1. Senior Project 2008 Ultra Wideband Amplifier Sarah Kief Saif Anwar Advisor: Dr. Shastry Bradley University Electrical Engineering

  2. Outline • UWB overview • Project Description • Design procedures • Lumped element Design • M-derive Design Layout • Microstrip Design • Coplanar Wave Guide Design • Final Layout • Future work

  3. Applications

  4. Signal Encoder Receiver Amplified received signal Signal Pulse Generator Low Noise Amplifier Received signal Transmitter Amplifier Filter for outside interference Receiving Antenna Transmitting Antenna Block Diagram

  5. Ultra Wideband Overview • UWB definition • Spectrum, 3.1 – 10.6 GHz • Large bandwidth, low power, short distances • Uses Gaussian Pulses.

  6. Frequency Spectrum

  7. UWB History • History • First used in 1901 • Gugleilmo Marconi transmitted Morse code using spark-gap radio transmitters • 1960s to 1980s restricted to government use • 1998 FCC legalized for commercial use

  8. Previous Work • Senior Project 2007 done by Jarred Cook and Nathan Gove. • Goal was to create a scaled down UWB transceiver. • Research done by other members of the scientific community.

  9. Previous Work

  10. Project Description • Functional Description • Topology: Distributed Amplifier (DA) • Low Noise Amplifier (LNA) implemented with a Gas FETs-NE4210S01, Pseudomorphic Hetero-Junction FET • Specifications • Gain: 16 dB • Noise Figure: 2.5 dB • Requirements • Frequency Range • External Interferences

  11. External Interferences

  12. DC-IV Curves

  13. Bias Selection • DC-IV curves and bias point selection.

  14. Cin and Cout Calculation

  15. Lumped Component Schematic

  16. M-Derived Design

  17. Translated lumped element components into respective lengths and widths in the MSTRIP program Capacitors Zo=30 ohms Inductor Zo=90 ohms Built layout in ADS and simulated Microstrip Line Design

  18. Microstrip Layout

  19. Simulations • Amplifier Gain • Phase Linearity

  20. Stability Factor

  21. Test Transistors Chose RT/Duriod 6002 board Thickness : .508 mm Dielectric Constant : 2.94 1 oz copper plating High mechanical strength Designed dimensions Line calc in ADS Width of center conductor = 1.24 mm Air Gap = .63 mm Length of center conductor = 10 mm Coplanar Wave Guide Design

  22. Full Coplanar Wave Guide

  23. Half Coplanar Wave Guide Layout

  24. ADS Schematic of Coplanar Waveguide

  25. Layout Simulation

  26. De-Embedding In AdS • Equation 1: Tm = Tmeasured = stot(s) • Equation 2: Tf = Tm/(((stot(simulations_half_cplanarwg(s))))^2 • Equation 3: St = ttos((Tf)

  27. DC-IV Curves of Transistor

  28. Final Amplifier Layout

  29. Simulations Amplifier Gain Phase Linearity of Amplifier

  30. Stability Factor • k = stability check, k ≥ 1 (unconditionally stable) • b = stability measurement, b has to always be positive

  31. Noise Figure • nf(2) is the noise figure of the ultra wideband amplifier over the spectrum. • NF is the mean value, 2.06 dB

  32. Manufacture new full coplanar waveguides Measure S-parameters Do de-embedding Run simulation of amplifier using s-parameter from de-embedding Re-optimize Manufacture the amplifier Future Work

  33. Questions?

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