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Electronic Engineering Department Universitat Politècnica de Catalunya

High Efficiency RF Power Amplification for 3G Mobile Communications Lázaro Marco, Thesis Advisor: Eduard Alarcón (UPC). Dragan Maksimović (University Of Colorado). Electronic Engineering Department Universitat Politècnica de Catalunya. Outline. Motivation EER Technique Implementation

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Electronic Engineering Department Universitat Politècnica de Catalunya

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  1. High Efficiency RF Power Amplification for 3G Mobile CommunicationsLázaro Marco, Thesis Advisor: Eduard Alarcón (UPC) Dragan Maksimović (University Of Colorado) Electronic Engineering Department Universitat Politècnica de Catalunya

  2. Outline Motivation EER Technique Implementation Improvements Circuit/System co-characterization Conclusions 1st Barcelona Forum on Ph.D. Research in Electronic Engineering

  3. Motivation • “Actual” modulations: • Constant envelope modulation techniques • Audio, data and video streaming • Increased data rates • High number of users/cell • Actual standards pushed to the limit Non linear amplifiers • Improved modulations: • Non-constant envelope modulation techniques • High bandwidth modulations High linearity in amplifiers • Miniaturization reduces battery size • Extended capabilites increase the overall power consumption • Long battery life required New schemes of highly efficient and highly linear amplification Linear Amplifiers exhibit Low Efficiency

  4. Envelope Elimination and Restoration Envelope Elimination and Restoration (EER) / Kahn technique (proceedings IRE 1952) s(t) 1st Barcelona Forum on Ph.D. Research in Electronic Engineering 4

  5. Envelope Elimination and RestorationImplementation Issues Numerous limits due to its high bandwidth EA RFPA Delay mismatch between paths AM/PM and supply distortion modulation COMPONENT SEPARATOR env envOUT 1 RFIN RFOUT Ф or RF 1st Barcelona Forum on Ph.D. Research in Electronic Engineering 5

  6. EER: Successful Implementation • Successful EDGE envelope tracking with the new prototype including 4.3MHz switcher • High-efficiency class-E PA • 50% system efficiency • Complete prototype system meets EDGE spectral mask 1st Barcelona Forum on Ph.D. Research in Electronic Engineering 6

  7. Improvements (I): Multiple Level PWM Twice equivalent switching frequency • Higher Bandwidth (fixed Ripple) • Lower Ripple (fixed LC) 1st Barcelona Forum on Ph.D. Research in Electronic Engineering 7

  8. Improvements (II): Linear Assisted Switching Converter 1st Barcelona Forum on Ph.D. Research in Electronic Engineering 8

  9. Improvements (III): Time-optimal nonlinear control Output voltage error Example: Vg = 6.5 V, L = 1 mH, C = 288 mF, fs = 780 KHz, Vref = 1.3 V, Iload = 0-10 A Capacitor current Switch control V. Yousefzadeh, A. Babazadeh, B. Ramachandran, L. Pao,, D. Maksimovic, E. Alarcón, “Proximate Time-Optimal Digital Control for DC-DC Converters” IEEE PESC 2007 1st Barcelona Forum on Ph.D. Research in Electronic Engineering 9

  10. Circuit/System co-characterization L sw p f =1/2 LC o C V sw bat f L DC s PWM i o j (t) L v (t) r M C ou t 1 b R load e(t) v (t) Cartesian in to Polar 1st Barcelona Forum on Ph.D. Research in Electronic Engineering 10

  11. Conclusions EER Technique is ready to be used in some mid-generation wireless standards Future-generation standards require sophisticated converter topologies and control methods Circuit/System co-characterization to validate new envelope trackers for wideband power management Eventual target is complete circuit-level co-design aiming appropriate system performance in the communications layer 1st Barcelona Forum on Ph.D. Research in Electronic Engineering

  12. Thanks for your attendance.Questions? High Efficiency RF Power Amplification for 3G Mobile Communications Lázaro Marco (lmarco@eel.upc.edu) 1st Barcelona Forum on Ph.D. Research in Electronic Engineering

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