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A Current-Switching Phase Shifter for Millimeter-Wave Applications Chien M. TA, Efstratios SKAFIDAS, and Robin J. EVANS National ICT Australia (NICTA) Department of Electrical and Electronic Engineering The University of Melbourne. Outline. Introduction to 60-GHz wireless communications

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Outline

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  1. A Current-Switching Phase Shifter forMillimeter-Wave ApplicationsChien M. TA, Efstratios SKAFIDAS, and Robin J. EVANSNational ICT Australia (NICTA)Department of Electrical and Electronic Engineering The University of Melbourne

  2. Outline • Introduction to 60-GHz wireless communications • Phased-array antennae • Phase shifter design • Results • Conclusions NEWCAS-TAISA 2009, Toulouse, France

  3. 60 GHz wireless communications • Unlicensed band • 7GHz of bandwidth • Multi-Gbps wireless communications • High path loss • 88dB free-space loss at 60GHz and 10m distance • Additional attenuation due to oxygen absorption • Phased-array antenna system • Low cost • CMOS technology NEWCAS-TAISA 2009, Toulouse, France

  4. Steerable antenna system Transmitter: focus output power Receiver: improve SNR, reject interferers NEWCAS-TAISA 2009, Toulouse, France

  5. Array factor NEWCAS-TAISA 2009, Toulouse, France

  6. Published 60-GHz phase shifters • [Alalusi CICC 2006] • Vector modulator • Pros: 360° phase control • Cons: high power consumption (~72mW) • [Wu EuMIC 2007] • Vector modulator • Pros: continuous, 360° phase control • Cons: lossy (more than 17dB) • [Ta CCECE 2008] • Distributed • Pros: negligible power consumption • Cons: lossy, narrow phase control range NEWCAS-TAISA 2009, Toulouse, France

  7. Proposed phase shifter architecture • Discrete phases determined by length of transmission line • Current switching mode NEWCAS-TAISA 2009, Toulouse, France

  8. Schematic • M0: input transconductance, sized and biased for high gain and low noise • M1-4: switches • V000, V090, V180, V270: digital input for phase control NEWCAS-TAISA 2009, Toulouse, France

  9. Layout • 65-nm RF-CMOS • Microstrip lines • MIM capacitors • 525μm × 470μm NEWCAS-TAISA 2009, Toulouse, France

  10. Simulation results 90° 90° 90° NEWCAS-TAISA 2009, Toulouse, France

  11. Simulation results (cont’d) NEWCAS-TAISA 2009, Toulouse, France

  12. Conclusions and future works • Active phase shifter on CMOS • 57 to 66 GHz • 90°-step output phase • Low noise • Digitally controlled • Experimental works • Chip is under fabrication • Phase shifter measurement • Antenna array measurement NEWCAS-TAISA 2009, Toulouse, France

  13. A Current-Switching Phase Shifter forMillimeter-Wave ApplicationsTA, Chien M., SKAFIDAS, Efstratios, and EVANS, Robin J. National ICT Australia (NICTA) Department of Electrical and Electronic Engineering The University of Melbourne

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