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

Presentation Overview Update on Project Goals Update on Project Goals Power Amplifier Overview Power Amplifier Overview Branch-Line Coupler Branch-Line Coupler ADS Models ADS Models Simulation Results Simulation Results Tentative Schedule Tentative Schedule Questions Questions

Project Goals Original Original PA and DA from scratchPA and DA from scratch Use Power Splitters/Combiners for increased powerUse Power Splitters/Combiners for increased power WiMAX Application (2-3 GHz)WiMAX Application (2-3 GHz) Output Power = 1 WattOutput Power = 1 Watt

Project Goals Updated Updated Tuning of Commercially Available Power AmplifierTuning of Commercially Available Power Amplifier Power Splitter/Combiner designed from scratchPower Splitter/Combiner designed from scratch WiFi application ( GHz)WiFi application ( GHz) Output Power = 100mWOutput Power = 100mW

Power Amplifier Module

Power Splitters/Combiners Why use them? Why use them? Same gainSame gain Higher powerHigher power Branch Line vs. Wilkinson Branch Line vs. Wilkinson Extra Resistor NeededExtra Resistor Needed Return LossesReturn Losses

Branch Line Coupler Model

Branch Line Coupler Theory

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

First Iteration ADS Model: BLC

First Iteration ADS Results: BLC

Tuned ADS Model: BLC

Tuned ADS Model Results: BLC

ADS Layout: BLC

First Iteration ADS Model: PA Module

First Iteration ADS Results: PA Module

Design Overview Power Amplifiers have been purchased -FR-4 Eval Board Power Amplifiers have been purchased -FR-4 Eval Board Additional circuitry is given in the Data Sheet for the Amplifier Additional circuitry is given in the Data Sheet for the Amplifier Fabrication will be outsourced Fabrication will be outsourced

RF5622 Power Amplifier Input/Output Matching Input/Output Matching DC Bias Circuits DC Bias Circuits

RF5622 Power Amplifier Layout

Testing Procedure WiMAX WiMAX Instrumentation cannot handle the power levels we’ll be usingInstrumentation cannot handle the power levels we’ll be using WiFi WiFi Requires much less powerRequires much less power

Testing Procedure Network Analyzer Network Analyzer Measures Return Losses, VSWR,Measures Return Losses, VSWR,S-Parameters Spectrum Analyzer Spectrum Analyzer Measures Output PowerMeasures Output Power

Tasks Send BLC model out for Fabrication Send BLC model out for Fabrication Simulation with Evaluation Board Simulation with Evaluation Board Finalize ADS Model of our PA Module Finalize ADS Model of our PA Module Send Model of PA Module out for Fabrication Send Model of PA Module out for Fabrication Solder Components Solder Components Test Test Present Results Present Results

Tentative Work Schedule To be done before Spring Break To be done before Spring Break All models sent for FabricationAll models sent for Fabrication Testing with Evaluation BoardTesting with Evaluation Board To be done after Spring Break To be done after Spring Break Solder ComponentsSolder Components TestTest Present ResultsPresent Results

References Gonzalez, Guillermo. " " Microwave Transistor Amplifiers: Analysis and Design. Upper Saddle River, NJ: Prentice Hall, Print. Gonzalez, Guillermo. " " Microwave Transistor Amplifiers: Analysis and Design. Upper Saddle River, NJ: Prentice Hall, Print. Grebennikov, Andrei. "Power Amplifier Design Fundamentals: More Notes from the Pages of History." High Frequency Electronics May 2010: Grebennikov, Andrei. "Power Amplifier Design Fundamentals: More Notes from the Pages of History." High Frequency Electronics May 2010: "High Power RF Amplifier." RF Power Amplifier | Powerful Amplification. Web. 25 Sept "High Power RF Amplifier." RF Power Amplifier | Powerful Amplification. Web. 25 Sept "RF Power Amplifier." Wikipedia, the Free Encyclopedia. Web. 25 Sept "RF Power Amplifier." Wikipedia, the Free Encyclopedia. Web. 25 Sept RFMD, comp. RF5622 Data Sheet. Greensboro, NC: RFMD, Print. RFMD, comp. RF5622 Data Sheet. Greensboro, NC: RFMD, Print.

Questions? We may or may not have reasonable answers! We may or may not have reasonable answers!