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PhD Final Exam – Kai Zhan

Low Power mm-Wave Transceiver for Short-Range MIMO Wireless and Guided Metal Wires Links

Low power mm-wave transceivers are of interest for achieving energy-efficient high data rate short-reach wireless and wireline links. Space-shift keying (SSK) or spatial modulation can provide increased energy-efficiency by using antennas/beam switching to transfer data. Such links are attractive at mm-wave due to small physical size, large available bandwidth and potential applications in slow-varying short-range wireless channels. Low-power pulsed phased-array mm-wave TX has been demonstrated that maintains energy-efficiency while providing beam switching functionality. A pulsed mm-wave digitally-controlled oscillator (DCO) provides low-power FSK capability, while variable pulse trigger delay achieves controlled relative phase between TX elements for low-power space-shift keying (SSK). A two-element FSK/SSK 65nm CMOS TX prototype is packaged with PCB antennas to demonstrate a 2-FSK/4-SSK 3Gb/s TX up to 60cm with 21.4mW power consumption, achieving ~7.1pJ/bit. A two-element mm-wave FSK/SSK RX is presented that can concurrently demodulate FSK and SSK by using relative outputs of a two-element combiner to d! etect angle-of-incidence. A 65nm CMOS 68GHz 2-element RX prototype is packaged with aperture-coupled PCB antennas to demonstrate >2Gb/s data rates while consuming <30mW across both elements. The first end-to-end CMOS SSK link using CMOS FSK-SSK TX and RX is demonstrated with 2Gb/s data transfer across ~6cm in a reflective channel. Guided mm-wave electrical links over metal wire waveguides promise another direction for achieving energy-efficient high data rate links. The low loss and wide dispersion-flat bandwidth of Sommerfeld-wave propagation on a single conductor wire (SCW) and TEM-wave propagation on a two conductor wires (TCW) make such guided mm-wave electrical links promising. In the second work, the first fully-integrated end-to-end wireline transceiver system on a SCW using Sommerfeld-wave propagation mode is demonstrated using a 60GHz carrier frequency. Implemented in 65nm CMOS, the proposed system includes on-chip radial-mode antennas as well as integrated serializers, 60GHz OOK modulator, demodulator, deserializers and clocking. The link achieves 7Gb/s data rate across 20cm of 26AWG bare copper wire (diameter = 0.4mm), while consuming 70.9mW of power. Operating at 6Gb/s and 7Gb/s, this work achieves BER < 10−12 and 10−5 respectively.

Major Advisor: Arun Natarajan
Committee: Karti Mayaram
Committee: Gabor C. Temes
Committee: Tejasvi Anand
GCR: Janet Tate

Wednesday, March 13 at 3:00pm to 5:00pm

Kelley Engineering Center, 1007
110 SW Park Terrace, Corvallis, OR 97331

Event Type

Lecture or Presentation

Event Topic


College of Engineering, Electrical Engineering and Computer Science
Contact Name

Calvin Hughes

Contact Email

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