RF Power Amplifier Design and Testing By Jonathan

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

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

Project Goals n Original • PA and DA from scratch • Use Power Splitters/Combiners for increased power • Wi. MAX Application (2 -3 GHz) • Output Power = 1 Watt

Project Goals n Updated • Tuning of Commercially Available Power Amplifier • Power Splitter/Combiner designed from scratch • Wi. Fi application (2. 4 -2. 5 GHz) • Output Power = 100 m. W

Power Amplifier Module

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

Branch Line Coupler Model

Branch Line Coupler Theory

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

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

RF 5622 Power Amplifier n n Input/Output Matching DC Bias Circuits

RF 5622 Power Amplifier Layout

Testing Procedure n Wi. MAX • Instrumentation cannot handle the power levels we’ll be using n Wi. Fi • Requires much less power

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

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

Tentative Work Schedule n To be done before Spring Break • All models sent for Fabrication • Testing with Evaluation Board n To be done after Spring Break • Solder Components • Test • Present Results

References n 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>. RFMD, comp. RF 5622 Data Sheet. Greensboro, NC: RFMD, 2006. Print.

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