Senior Project 2008 Ultra Wideband Amplifier Sarah Kief Saif Anwar Advisor: Dr. Shastry Bradley University Electrical Engineering
Outline n n n n Ultra Wideband? Introduction to UWB system Review of previous work Patents and standards Functional Description Progress Questions
Ultra Wideband What is Ultra Wideband System?
Ultra Wideband Overview n History • First used in 1901 • Gugleilmo Marconi transmitted Morse code using spark-gap radio transmitters • 1960 s to 1980 s restricted to government use • 1998 FCC legalized for commercial use n UWB definition • Large bandwidth, low power, short distances • Uses Gaussian Pulses. n n Frequency Range – 3. 1 to 10. 6 GHz Applications
Previous Work n Senior Project 2007 done by Jarred Cook and Nathan Gove. • Goal was to create a scaled down UWB transceiver. n n Research done by other members of the scientific community. Table
Patents and Standards n Regulations • The minimum bandwidth must occupy more than 20% of the center frequency. • The minimum bandwidth must exceed 500 MHz. n 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 n Standards • ECMA 368 – High Rate Ultra Wideband PHY and MAC Standard • ECMA 369 – MAC-PHY Interface for ECMA-368
Project Description n Functional Description • Topology: Distributed Amplifier (DA) • Low Noise Amplifier (LNA) implemented with a Gas FETs. NE 4210 S 01, Pseudomorphic Hetero-Junction FET n Requirements • External Interferences • Frequency Range • Cutoff Frequency = 20 Ghz n Specifications • Gain: 16 d. B • Noise Figure: 2. 5 d. B • Power Dissipated: ≈60 m. W n n System Block Diagram Timeline
Project Goals n n Researching Designing • Simulations n Fabricating • In house n n Micro strip Testing platform for s-parameters • Commercial n Testing • Compare simulations with measured data
Progress n Brief Design Steps • Design Equations n DC-IV Curves • Bias Point Selection n Cin and Cout Calculations Lumped Element Schematic S-Parameters
Questions?
Ultra Wideband System
Ultra Widband System
Previous Work Reference Gain (d. B) NF (d. B) BW (GHz) PD (m. W) Topology Technology [1] 17. 5 3. 1 -10. 6 33. 2 Distributed 0. 18 µm CMOS [2] 10 6. 4 3. 1 -10. 6 5. 4 Distributed 0. 35 µm Si. Ge Bi. CMOS [3] 9 5. 3 3. 1 -10. 6 22 Distributed 0. 18 µm CMOS [4] 20 6. 5 1. 6 -12. 1 40 Low Power Distributed 0. 35 µm Si. Ge Bi. CMOS [5] 7. 3 4. 3 -6. 1 0 -22 53 Distributed 0. 18 µm CMOS [6] 10. 6 3. 4 -5. 3 0 -14 52 Distributed 0. 18 µm CMOS [7] 6 6 1 -27 68. 1 Distributed 0. 18 µm CMOS
![External Interferences Standard Frequency Range Reference IEEE 802. 11 a 5 GHz [8] IEEE](https://present5.com/presentation/85a1b374e651ccb2738480d8d4e9b2aa/image-14.jpg "External Interferences Standard Frequency Range Reference IEEE 802. 11 a 5 GHz [8] IEEE")
External Interferences Standard Frequency Range Reference IEEE 802. 11 a 5 GHz [8] IEEE 802. 11 i 2. 4 GHz and 5 GHz [8] IEEE 802. 16 Wi. MAX 2 GHz – 11 GHz [9]
Block Diagram
Timeline Week of Tasks to complete January 25 th Designing the microstrip version of lumped element model. February 7 th Board and inductor selections, continue designing February 14 th Simulations February 21 st Test scattering parameters and compare them to simulated results. February 28 th Design filtering system to reject outside interference March 6 th Design filtering system to reject outside interference March 13 th Fabrication March 20 th Spring break March 27 th Testing of amplifier April 3 rd Testing of amplifier April 10 th Testing of amplifier April 17 th Optimization April 24 th Optimization May 1 st Project proposal and oral preparations May 8 th Finals
Design Equations
DC-IV Curves
Bias Point Selection
Distributed Amplifier
Cin and Cout
The End
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