UWB chips for embedded applications Stanislas Voinot Emil

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 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 UWB 4 SN 04/11/05 2 Stanislas Voinot, STANTEC

UWB Technologies (novel band) Regulation Free market US (FCC-2002) Allowed power: 500 µW or -2. 55 d. Bm 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 ? UWB 4 SN 04/11/05 3 Stanislas Voinot, STANTEC

Transmitter : DSSS-FD-UWB Patented technique Frequency Fn Spread Spectrum F 1 Frequency Diversity F 0 Bits DSSS Pulse Generator time F 0 T F 1 UWB 4 SN 04/11/05 1/T 4 Fn Stanislas Voinot, STANTEC

DSSS-FD-UWB (2 bands) T PRF 2/T F 0 - Fa max UWB 4 SN 04/11/05 F 0 2/T F 0 + Fa max Fn – Fa’ max 5 Fn Fn + Fa’ max Stanislas Voinot, STANTEC

Avantages DSSS-FD UWB for two bands Authorized power Single pulse : DS UWB PSD without filter Bandwith 2 GHz Average over 1 µs F 0=3. 5 GHz & F 1=4. 5 GHz F 0 Pe << Pa Fn DSSS-FD-UWB Avantages Spectrum coverage not connected with pulse width Double diversities (Hardness of communication) Optimizations of spectral coverage § Power emission UWB 4 SN 04/11/05 6 Stanislas Voinot, STANTEC

Low power Receiver Optimized architecture and microelectronic design Chip size : 2 mm² Receiver chip picture UWB 4 SN 04/11/05 7 Stanislas Voinot, STANTEC

Technical model Protocol stack Ø Integrated customer’s protocol stack Ø Proprietary radio interface (IRF) Ø Open interface : IRF – Base Band UWB 4 SN 04/11/05 8 Stanislas Voinot, STANTEC

Product performances Target Coexistence with wireless actual and future standards Rate from 10 Kbps to 20 Mbps Flexibility of world regulation Robustness to interference Power consumption < 50 m. W Distance from 10 to 30 m Open interface to standard or customized protocol stack Sleeping mode management Network : point to point, star, mesh UWB 4 SN 04/11/05 9 Stanislas Voinot, STANTEC

Test bench realised with Tektronix DSO Tektronix Technical Note - May 2005 ( www. tektronix. com ) UWB 4 SN 04/11/05 10 Stanislas Voinot, STANTEC

UWB Front-End RF prototype UWB 4 SN 04/11/05 11 Stanislas Voinot, STANTEC

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 UWB 4 SN 04/11/05 12 Stanislas Voinot, STANTEC

UWB Market High Data rate>100 Mbps Applications PC Low Data Rate (# WIFI) 1 Kbps - 10 Mbps Outdoor OPPN Transducers SPIN Geoloc. Indoor 10< m <100 300 m Exemple USB wireless Distance < 10 m > 1 Km > 500 m. W < 10 m. W < 200 m. W Home Professional Industrial Professional Home Professional Supply Applications Home Professional Field UWB 4 SN 04/11/05 13 Stanislas Voinot, STANTEC