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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.

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Presentation on theme: "In partnership with STMicroelectronics DESIGN OF A CLASS 1 POWER AMPLIFIER FOR BLUETOOTH TM APPLICATIONS Advisors Candidate Prof. Antonella D’Orazio Giovanni."— Presentation transcript:

1 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 Politecnico di Bari Engineering Faculty - Electronics Engineering Course Thesis in MICROWAVES

2 OUTLINE CHECK OF SUITABLE COMPONENTS DESIGN AND ANALYSIS USING ANSOFT DESIGNER SV REALIZATION MEASUREMENTS STLC2500 WITH CLASS 1 PA IMPLEMENTATION

3 DESIGN CHALLENGES LOW COST HIGH POWER GAIN MINIMAL BOM

4 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

5 DESIGN MODEL Input Matching DC Block Output Matching DC Block Enable and Power Control RF Choke to DC Bias Biasing Transistor

6 DESIGN MODEL Input Matching DC Block Output Matching DC Block Trasmission Line Model RF Power Transistor RF Choke to DC Bias

7 ANALYSIS S 11 and S 22 at 2.45 GHz Gain from 500 MHz to 3 GHz

8 ANALYSIS Stability factor from 500 MHz to 3 GHz Input and output return loss from 500 MHz to 3 GHz

9 REALIZATION PCB Layout Photograph of the Class 1 PA

10 MEASUREMENTS Photograph of the Test Setup Class 1 Power Amplifier and Measurement Setup

11 MEASUREMENTS S 11 in Bluetooth Band S 22 in Bluetooth Band

12 MEASUREMENTS Gain, Output Power and Efficiency versus Input Power at 27 °C

13 MEASUREMENTS Output Power Efficiency versus Input Power for different Temperatures

14 MEASUREMENTS Pout and Efficiency vs Pin at various Temperatures and Vcc Vcc = 2.50 V Vcc = 3.00 V

15 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 %

16 STLC2500 CLASS 1 SOLUTION Output Power Output Spectrum, Adjacent Channel Power

17 STLC2500 CLASS 1 SOLUTION Output Spectrum RF = LO – BB = GHz IM = LO + BB = GHz PULLING = LO – 3BB = GHz Pulling Behavior at Default Gain Settings

18 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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