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Senior Project 2008

This project focuses on designing and fabricating an ultra wideband amplifier using gas FETs and a distributed amplifier topology. The goal is to achieve a gain of 16 dB, noise figure of 2.5 dB, and power dissipation of approximately 60 mW. The progress includes researching, designing, simulating, and fabricating the amplifier, followed by testing and comparing the results with the simulations. The project timeline and key design equations are also discussed.

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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 • Ultra Wideband? • Introduction to UWB system • Review of previous work • Patents and standards • Functional Description • Progress • Questions

  3. Ultra Wideband What is Ultra Wideband System?

  4. Ultra Wideband Overview • 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 • UWB definition • Large bandwidth, low power, short distances • Uses Gaussian Pulses. • Frequency Range – 3.1 to 10.6 GHz • Applications

  5. 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. • Table

  6. Patents and Standards • Regulations • The minimum bandwidth must occupy more than 20% of the center frequency. • The minimum bandwidth must exceed 500 MHz. • Patents • 7139454 Ultra-wideband fully synthesized high-resolution receiver and method • 7099422 Synchronization of ultra-wideband communications using a transmitted reference preamble • 7061442 Ultra-wideband antenna • 7020224 Ultra-wideband correlating receiver • 20060165155 System and method for ultra-wideband (UWB) communication transceiver • 20060062277 Ultra-wideband signal amplifier • 20060045134 Ultra-wideband synchronization systems and methods • Standards • ECMA 368 – High Rate Ultra Wideband PHY and MAC Standard • ECMA 369 – MAC-PHY Interface for ECMA-368

  7. Project Description • Functional Description • Topology: Distributed Amplifier (DA) • Low Noise Amplifier (LNA) implemented with a Gas FETs-NE4210S01, Pseudomorphic Hetero-Junction FET • Requirements • External Interferences • Frequency Range • Cutoff Frequency = 20Ghz • Specifications • Gain: 16 dB • Noise Figure: 2.5 dB • Power Dissipated: ≈60 mW • System Block Diagram • Timeline

  8. Project Goals • Researching • Designing • Simulations • Fabricating • In house • Micro strip • Testing platform for s-parameters • Commercial • Testing • Compare simulations with measured data

  9. Progress • Brief Design Steps • Design Equations • DC-IV Curves • Bias Point Selection • Cin and Cout Calculations • Lumped Element Schematic • S-Parameters

  10. Questions?

  11. Ultra Wideband System

  12. Ultra Widband System

  13. Previous Work

  14. External Interferences

  15. Block Diagram

  16. Timeline

  17. Design Equations

  18. DC-IV Curves

  19. Bias Point Selection

  20. Distributed Amplifier

  21. Cin and Cout

  22. The End

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