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UWB chips for embedded applications Stanislas Voinot, Emil Novakov, Jean-Michel Fournier 155 cours Berriat – 38000 Grenoble – tel 04 76 70 94 80 voinot@stantec.fr novakov@enserg.fr fournier@enserg.fr. www.stantec.fr www.uwb.fr. Story. 2002

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www.stantec.fr www.uwb.fr

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  1. UWB chips for embedded applications Stanislas Voinot, Emil Novakov, Jean-Michel Fournier 155 cours Berriat – 38000 Grenoble – tel 04 76 70 94 80 voinot@stantec.fr novakov@enserg.fr fournier@enserg.fr www.stantec.fr www.uwb.fr

  2. Story • 2002 • IMEP Labs (Grenoble) : low data rate communications • 2003 • Partnership with an UWB antenna manufacturer • 2004 • IP : novel access method for UWB communications • First UWB microelectronic design of radio frequency Front End • 2005 • French National Award for innovation et technological achievement • Prototypes IC (RF transmitter and receiver) : • UWB full duplex RF chip

  3. UWB Technologies (novel band) • Regulation • Free market US (FCC-2002) • Allowed power: 500 µW or -2.55 dBm over 7.5 GHz • European evaluations EU (ETSI) • USB wireless launcher improves speed acceptation • Avoid interferences with UMTS / GPS band • Technology advantages • Wireless high data rates • No interference… Power emission (mask UWB) • Simple techniques ?

  4. F0 Transmitter : DSSS-FD-UWB Patented technique Frequency Fn F1 Spread Spectrum Frequency Diversity F0 time Bits Pulse Generator DSSS T F1 1/T Fn

  5. DSSS-FD-UWB (2 bands) T PRF 2/T 2/T F0 - Fa max F0 F0 + Fa max Fn Fn – Fa’ max Fn + Fa’ max

  6. Authorized power Single pulse : DS UWB F0 Fn Pe << Pa Avantages DSSS-FD UWB for two bands • DSSS-FD-UWB Avantages • Spectrum coverage not connected with pulse width • Double diversities (Hardness of communication) • Optimizations of spectral coverage • Power emission PSD without filter Bandwith 2 GHz Average over 1 µs F0=3.5 GHz & F1=4.5 GHz

  7. Low power Receiver  • Optimized architecture and microelectronic design • Chip size : 2 mm² Receiver chip picture

  8. Technical model Protocol stack • Integrated customer’s protocol stack • Proprietary radio interface (IRF) • Open interface : IRF – Base Band

  9. Product performances • Target • Coexistence with wireless actual and future standards • Rate from 10Kbps to 20 Mbps • Flexibility of world regulation • Robustness to interference • Power consumption < 50 mW • Distance from 10 to 30 m • Open interface to standard or customized protocol stack • Sleeping mode management • Network : point to point, star, mesh

  10. Test bench Test bench realised with Tektronix DSO Tektronix Technical Note - May 2005 ( www.tektronix.com )

  11. UWB Front-End RF prototype

  12. Conclusion • A new UWB access technique was presented • This technique provides very good spectrum coverage • Frequency diversity used in this technique allows a good robustness against narrow band blockers Perspective • ICs based in this technique are being developed by STANTEC in low power CMOS technology

  13. UWB Market

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