RF Power Amplifier Design and Testing By Jonathan
RF Power Amplifier Design and Testing By: Jonathan Lipski and Brandon Larison Advisor: Dr. Shastry
Table of Applications
What is Wi. Max? n n n Worldwide Interoperability for Microwave Access Primary purpose is to provide mobile broadband connectivity Much greater range than Wi. Fi -(Wi-Fi on steroids)
First Approach n n n Design Power Amplifier from scratch -Driver and Power Researched several possible applications for the amplifier Began looking for a suitable transistor fabrication
Problems n n n Needed model for appropriate transistor, could not find any Needed to rethink our design, not enough time to complete this design Chose new design
Power Amplifier Module
Connector Version
Integrated Version
Design Overview n n n 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
Driver Amplifier n Receives a small amount of input power, and amplifies
Power Amplifier n n 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
Option 1: Wilkinson Power Divider
Option 2: Branch Line Coupler
Testing Procedure n Instrumentation cannot handle the power levels we’ll be using n Sampling n S-Parameters, Linearity, Efficiency
Tasks n Remainder of this semester -Order Amplifiers -Determine Architecture -Finalize Plans for next semester
Tasks n Next Semester -Simulation with Eval Boards -Determine Fabrication Method -Fabricate -Test Connector Version -Fabricate Integrated Version -Test -Present Results
If time permits… n Look into Heat Dissipation
Tentative Work Schedule n n n n Week Week Week Week 1: Receive Ordered Parts 2: Simulation 3: Simulation 4: Fabrication 5: Fabrication 6: Fabrication 7: Testing 8: Testing 9: Spring Break 10: Analysis of Results 11: Presentation Preparation 12: Presentation Preparation 13: Presentation 14: Play 15: Play 16: Graduate
References n n 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>.
Questions? n We may or may not have reasonable answers!
- Slides: 20