UWB chips for embedded applications Stanislas Voinot, Emil Novakov, Jean-Michel Fournier 155 cours Berriat – Grenoble – tel

Stanislas Voinot, STANTEC UWB4SN 04/11/05 2 Story 2002 IMEP Labs (Grenoble) : low data rate communications2003 Partnership with an UWB antenna manufacturer2004 IP : novel access method for UWB communications First UWB microelectronic design of radio frequency Front End2005 French National Award for innovation et technological achievement Prototypes IC (RF transmitter and receiver) :  UWB full duplex RF chip

Stanislas Voinot, STANTEC UWB4SN 04/11/05 3 UWB Technologies (novel band) Regulation Regulation Free market US (FCC-2002) Allowed power: 500 µW or 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 ?

Stanislas Voinot, STANTEC UWB4SN 04/11/05 4 Transmitter : DSSS-FD-UWB Patented technique DSSS Pulse Generator F1F1 FnFn F0F0 Bits Spread SpectrumFrequency Diversity T 1/T F0F0 F1F1 FnFn time Frequency

Stanislas Voinot, STANTEC UWB4SN 04/11/05 5 DSSS-FD-UWB (2 bands) F0 2/T Fn 2/T F0 + Fa maxF0 - Fa max Fn + Fa’ max Fn – Fa’ max PRFT

Stanislas Voinot, STANTEC UWB4SN 04/11/05 6 Avantages DSSS-FD-UWB Avantages Spectrum coverage not connected with pulse width Double diversities (Hardness of communication) Optimizations of spectral coverage  Power emission Single pulse : DS UWB F0F0 FnFn Authorized power Pe << Pa DSSS-FD UWB for two bands Average over 1 µs F 0 =3.5 GHz & F 1 =4.5 GHz PSD without filter Bandwith 2 GHz

Stanislas Voinot, STANTEC UWB4SN 04/11/05 7 Low power Receiver Optimized architecture and microelectronic design Chip size : 2 mm² Receiver chip picture

Stanislas Voinot, STANTEC UWB4SN 04/11/05 8 Technical model  Integrated customer’s protocol stack  Proprietary radio interface (IRF)  Open interface : IRF – Base Band Protocol stack

Stanislas Voinot, STANTEC UWB4SN 04/11/05 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

Stanislas Voinot, STANTEC UWB4SN 04/11/05 10 Test bench Test bench realised with Tektronix DSO Tektronix Technical Note - May 2005 ( )

Stanislas Voinot, STANTEC UWB4SN 04/11/05 11 UWB Front-End RF prototype

Stanislas Voinot, STANTEC UWB4SN 04/11/05 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

Stanislas Voinot, STANTEC UWB4SN 04/11/05 13 UWB Market High Data rate>100 Mbps Low Data Rate (# WIFI) 1Kbps - 10 Mbps ApplicationsExemplePC USB wireless Outdoor OPPN Transducers SPIN Geoloc.Indoor Distance < 10 m > 1 Km 10< m < m Supply > 500 mW < 500 mW < 10 mW < 200 mW Applications Field HomeProfessionalHomeProfessionalIndustrialProfessionalHomeProfessional