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RF Power Amplifier Design and Testing

RF Power Amplifier Design and Testing. By: Jonathan Lipski and Brandon Larison Advisor: Dr. Shastry. Table of Applications. What is WiMax?. Worldwide Interoperability for Microwave Access Primary purpose is to provide mobile broadband connectivity

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RF Power Amplifier Design and Testing

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  1. RF Power Amplifier Design and Testing By: Jonathan Lipski and Brandon Larison Advisor: Dr. Shastry

  2. Table of Applications

  3. What is WiMax? • Worldwide Interoperability for Microwave Access • Primary purpose is to provide mobile broadband connectivity • Much greater range than WiFi-(Wi-Fi on steroids)

  4. First Approach • Design Power Amplifier from scratch-Driver and Power • Researched several possible applications for the amplifier • Began looking for a suitable transistor for fabrication

  5. Problems • Needed model for appropriate transistor, could not find any • Needed to rethink our design, not enough time to complete this design • Chose new design

  6. Power Amplifier Module

  7. Connector Version

  8. Integrated Version

  9. Design Overview • 2 Power Amplifiers and 2 Driver Amplifiers will be purchased-Eval Boards • Additional circuitry will be designed in the lab • Fabrication will either be done in lab or outsourced

  10. Driver Amplifier • Receives a small amount of input power, and amplifies

  11. Power Amplifier • Receives the output power of the Driver Amplifier, and further amplifies • Amplifies the power to increase the range of a signal sent through the air

  12. Option 1: Wilkinson Power Divider

  13. Option 2: Branch Line Coupler

  14. Testing Procedure • Instrumentation cannot handle the power levels we’ll be using • Sampling • S-Parameters, Linearity, Efficiency

  15. Tasks • Remainder of this semester-Order Amplifiers-Determine Architecture -Finalize Plans for next semester

  16. Tasks • Next Semester-Simulation with Eval Boards-Determine Fabrication Method-Fabricate-Test Connector Version-Fabricate Integrated Version-Test-Present Results

  17. If time permits… • Look into Heat Dissipation

  18. Tentative Work Schedule • Week 1: Receive Ordered Parts • Week 2: Simulation • Week 3: Simulation • Week 4: Fabrication • Week 5: Fabrication • Week 6: Fabrication • Week 7: Testing • Week 8: Testing • Week 9: Spring Break • Week 10: Analysis of Results • Week 11: Presentation Preparation • Week 12: Presentation Preparation • Week 13: Presentation • Week 14: Play • Week 15: Play • Week 16: Graduate

  19. References • Gonzalez, Guillermo. "4.7-4.8." Microwave Transistor Amplifiers: Analysis and Design. Upper Saddle River, NJ: Prentice Hall, 1997. 352-74. Print. • Grebennikov, Andrei. "Power Amplifier Design Fundamentals: More Notes from the Pages of History." High Frequency Electronics May 2010: 18-30. • "High Power RF Amplifier." RF Power Amplifier | Powerful Amplification. Web. 25 Sept. 2011. <http://www.rfpoweramplifier.org/high_power_rf_amplifier.html>. • "RF Power Amplifier." Wikipedia, the Free Encyclopedia. Web. 25 Sept. 2011. <http://en.wikipedia.org/wiki/RF_power_amplifier>.

  20. Questions? • We may or may not have reasonable answers!

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