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RF Power Amplifier Design and Testing

Follow the design process of RF power amplifiers for WiMax applications, challenges faced, and testing procedures. Explore amplifier modules, driver amplifiers, and integrated designs. Learn about Wilkinson power dividers and branch line couplers. Discover the tasks, work schedule, and references involved in the project.

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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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