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Published byTerrance Levins Modified over 10 years ago
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In partnership with STMicroelectronics DESIGN OF A CLASS 1 POWER AMPLIFIER FOR BLUETOOTH TM APPLICATIONS Advisors Candidate Prof. Antonella D’Orazio Giovanni DE FILIPPO Tutor. Dr. Roberto Antonicelli. A.Y. 2004-05 Politecnico di Bari Engineering Faculty - Electronics Engineering Course Thesis in MICROWAVES
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OUTLINE CHECK OF SUITABLE COMPONENTS DESIGN AND ANALYSIS USING ANSOFT DESIGNER SV REALIZATION MEASUREMENTS STLC2500 WITH CLASS 1 PA IMPLEMENTATION
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DESIGN CHALLENGES LOW COST HIGH POWER GAIN MINIMAL BOM
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ELECTRICAL SPECIFICATIONS Central Frequency: 2.45 GHz Bandwidth: 100 MHz Input and Output Impedance: 50 Ohms Output Powers: 10, 14 and 18 dBm Supply Voltage: 2.75 Volts Operating Temperature: -40 to +85°C
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DESIGN MODEL Input Matching DC Block Output Matching DC Block Enable and Power Control RF Choke to DC Bias Biasing Transistor
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DESIGN MODEL Input Matching DC Block Output Matching DC Block Trasmission Line Model RF Power Transistor RF Choke to DC Bias
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ANALYSIS S 11 and S 22 at 2.45 GHz Gain from 500 MHz to 3 GHz
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ANALYSIS Stability factor from 500 MHz to 3 GHz Input and output return loss from 500 MHz to 3 GHz
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REALIZATION PCB Layout Photograph of the Class 1 PA
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MEASUREMENTS Photograph of the Test Setup Class 1 Power Amplifier and Measurement Setup
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MEASUREMENTS S 11 in Bluetooth Band S 22 in Bluetooth Band
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MEASUREMENTS Gain, Output Power and Efficiency versus Input Power at 27 °C
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MEASUREMENTS Output Power Efficiency versus Input Power for different Temperatures
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MEASUREMENTS Pout and Efficiency vs Pin at various Temperatures and Vcc Vcc = 2.50 V Vcc = 3.00 V
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PERFORMANCE OVERVIEW Compression Point P -1dB = 20 dBm Power Gain Gp = 12 dB Current consumption at max power I cc = 53 mA Added Efficiency η = 70 %
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STLC2500 CLASS 1 SOLUTION Output Power Output Spectrum, Adjacent Channel Power
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STLC2500 CLASS 1 SOLUTION Output Spectrum RF = LO – BB = 2.44084 GHz IM = LO + BB = 2.44116 GHz PULLING = LO – 3BB = 2.44052 GHz Pulling Behavior at Default Gain Settings
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CONCLUSIONS Single transistor, small sized Bluetooth Class 1 power amplifier Lowest cost in marketplace High gain and high 1 dB-compression point 12mA of quiescent current and 70% total efficiency Single 2.75V supply voltage Minimum BOM Stable behavior versus temperature and Vcc
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