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Millimeter-Wave Phase Shifter on CMOS for Beamforming Applications

This paper discusses the design and optimization of a millimeter-wave phase shifter on CMOS for beamforming applications in wireless communications at 60 GHz. The results show good impedance matching and constant group delay.

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Millimeter-Wave Phase Shifter on CMOS for Beamforming Applications

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  1. A Millimeter-Wave Phase Shifter on CMOSfor Beamforming ApplicationsTA, Chien M., SKAFIDAS, Efstratios, EVANS, Robin J. and HOANG, Chien D.†NICTA, Dept. of Electrical and Electronic Eng., The Univ. of Melbourne†Dept. of Telecommunications, Ho Chi Minh City Univ. of Technology

  2. Outline • Wireless communications at 60 GHz • Phased array antennae • Design of the phase shifter • Design of a π-segment • Design and optimization of the varactor • Results • Conclusions ICEE 2008, Okinawa, Japan

  3. 60 GHz wireless communications • Unlicensed band • 7 GHz of bandwidth worldwide • Multi-Gbps wireless communications • Low power • Portable applications • Low cost • CMOS • High path loss • 88 dB free space loss at 60GHz and 10 m distance • Additional attenuation due to oxygen absorption • Phased-array antenna system ICEE 2008, Okinawa, Japan

  4. Steerable antennae Transmitter: focus output power Receiver: improve SNR, reject interferers ICEE 2008, Okinawa, Japan

  5. Phase shifter architecture • Cascade of multiple π-segments • Distributed design for wideband operation ICEE 2008, Okinawa, Japan

  6. Design of a π-segment • Each π-segment is matched to Z0 • L (66 pH) is realized as a transmission line • C (27 fF) is realized as a varactor ICEE 2008, Okinawa, Japan

  7. MOS varactor optimization • Design parameters • Finger width • Finger length • Number of fingers • Capacitance tuning ratio • Affect the phase tuning range • Need to reduce Cf single finger device • Quality factor • Affect the insertion loss • Need to reduce Rpc and Rs multiple-finger device • (6 x 3) x (0.24um x 1um) ICEE 2008, Okinawa, Japan

  8. Layout considerations • Compact, extensible layout • Side-shielded microstrip line • Impedance matching network for testing purpose ICEE 2008, Okinawa, Japan

  9. Performance • Maximum phase shift of 100 degrees • Maximum insertion loss of 6 dB ICEE 2008, Okinawa, Japan

  10. Performance (cont’d) • Wideband matching to 50-Ohm termination • Less than 4ps group delay variation around 60-GHz ICEE 2008, Okinawa, Japan

  11. Conclusions • A phase shifter on CMOS • Millimeter-wave operation • Good impedance matching • Constant group delay ICEE 2008, Okinawa, Japan

  12. THANK YOU

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