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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 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
Presentation Overview • Project Goals • Power Amplifier Overview • Branch-Line Coupler • ADS Models • Simulation Results • Final Results • Concluding Remarks • Questions
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
RFMD RF5622 Power Amplifier • Input/Output Matching • DC Bias Circuits
Power Splitters/Combiners • Why use them? • Same gain • Higher power • Branch Line vs. Wilkinson • Extra Resistor Needed
Calculations • Widths & Lengths • MSTRIP.exe • Center Frequency and Characteristic Impedance • VT-42 Data Sheet (Micro Circuits) • Height of substrate • Dielectric Constant
Testing Procedure • WiMAX • Instrumentation cannot handle the power levels we’ll be using • WiFi • Requires much less power
Testing Procedure • Network Analyzer • Measures Return Losses, VSWR, S-Parameters • Spectrum Analyzer • Measures Output Power
Final Results • Board currently needs to be soldered • Testing will occur after • Results and Simulation comparisons will be documented in final report
Concluding Remarks Aspects we learned: • Power Amplifier Theory • Power Divider/Combiner Design • Microstrip Line Fabrication
Concluding Remarks Recommendations for Future: • Choose the design first, application second • Estimate fabrication time, then double it
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.