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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. Why is this important?. “Wherever there are wireless communications, there are transmitters, and wherever there are transmitters, there are RF power amplifiers” -Steve Cripps.

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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. Why is this important? • “Wherever there are wireless communications, there are transmitters, and wherever there are transmitters, there are RF power amplifiers” -Steve Cripps

  3. Presentation Overview • Project Goals • Power Amplifier Overview • Branch-Line Coupler • ADS Models • Simulation Results • Final Results • Concluding Remarks • Questions

  4. Project Goals • Building of Power Amplifier Module using: • Commercially Available Power Amplifier Chip • Power Splitter/Combiner designed from scratch • WiFiapplication (2.4-2.5 GHz) • Output Power = 100mW

  5. RFMD RF5622 Power Amplifier • Input/Output Matching • DC Bias Circuits

  6. RF5622 Power Amplifier Layout

  7. Power Amplifier Module

  8. Power Splitters/Combiners • Why use them? • Same gain • Higher power • Branch Line vs. Wilkinson • Extra Resistor Needed

  9. Branch Line Coupler Model

  10. Branch Line Coupler Theory

  11. Calculations • Widths & Lengths • MSTRIP.exe • Center Frequency and Characteristic Impedance • VT-42 Data Sheet (Micro Circuits) • Height of substrate • Dielectric Constant

  12. First Iteration ADS Model: BLC

  13. First Iteration ADS Results: BLC

  14. Port Performance relative to Port 1

  15. Return Losses

  16. Phase Difference

  17. Isolation Losses

  18. Tuned ADS Model: BLC

  19. Tuned ADS Model Results: BLC

  20. Port Performance relative to Port 1

  21. Return Losses

  22. Phase Difference

  23. Isolation Losses

  24. ADS Layout: BLC

  25. First Iteration ADS Model: PA Module

  26. First Iteration ADS Results: PA Module

  27. Port Performance relative to Port 1

  28. Return Losses

  29. Phase Difference

  30. Isolation Losses

  31. Tuned ADS Model: PA Module

  32. Tuned ADS Results: PA Module

  33. Port Performance relative to Port 1

  34. Return Losses

  35. Phase Difference

  36. Isolation Losses

  37. ADS Layout: PA Module

  38. ADS Layout: PA Chip

  39. PA Module

  40. Testing Procedure • WiMAX • Instrumentation cannot handle the power levels we’ll be using • WiFi • Requires much less power

  41. Testing Procedure • Network Analyzer • Measures Return Losses, VSWR, S-Parameters • Spectrum Analyzer • Measures Output Power

  42. Final Results • Board currently needs to be soldered • Testing will occur after • Results and Simulation comparisons will be documented in final report

  43. Concluding Remarks Aspects we learned: • Power Amplifier Theory • Power Divider/Combiner Design • Microstrip Line Fabrication

  44. Concluding Remarks Recommendations for Future: • Choose the design first, application second • Estimate fabrication time, then double it

  45. References • Cripps, Steve C. RF Power Amplifiers for Wireless Communications. Boston: Artech House, 1999. Print. • 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>. • RFMD, comp. RF5622 Data Sheet. Greensboro, NC: RFMD, 2006. Print.

  46. Questions?

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