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www.stantec.fr www.uwb.fr
UWB chips for embedded applications
Stanislas Voinot, Emil Novakov, Jean-Michel Fournier155 cours Berriat – 38000 Grenoble – tel 04 76 70 94 80
Stanislas Voinot, STANTEC2UWB4SN 04/11/05
Story
20022002
IMEP Labs (Grenoble) : low data rate communications
2003 2003
Partnership with an UWB antenna manufacturer
2004 2004
IP : novel access method for UWB communications
First UWB microelectronic design of radio frequency Front End
20052005
French National Award for innovation et technological achievement
Prototypes IC (RF transmitter and receiver) : UWB full duplex RF chip
Stanislas Voinot, STANTEC3UWB4SN 04/11/05
UWB Technologies (novel band)
RegulationRegulation 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 advantagesTechnology advantagesWireless high data rates
No interference… Power emission (mask UWB)
Simple techniques ?
)log(103.41)( FdBmPe
Stanislas Voinot, STANTEC4UWB4SN 04/11/05
Transmitter : DSSS-FD-UWBPatented techniquePatented technique
DSSS Pulse Generator
F1
Fn
F0
Bits
Spread Spectrum Frequency Diversity
T
1/T
F0
F1
Fn
time
Frequency
Stanislas Voinot, STANTEC5UWB4SN 04/11/05
DSSS-FD-UWB (2 bands)
F0
2/T2/T
Fn
2/T2/T
F0 + Fa maxF0 - Fa max Fn + Fa’ maxFn – Fa’ max
PRFPRFTT
)))(sin(()()))(cos(()(1
)( '0
0 tttAtttAT
tEp ana
T
Stanislas Voinot, STANTEC6UWB4SN 04/11/05
Avantages
DSSS-FD-UWB AvantagesDSSS-FD-UWB AvantagesSpectrum coverage not connected with pulse width
Double diversities (Hardness of communication)
Optimizations of spectral coverage Power emission
Single pulse : DS UWB
F0 Fn
Authorized power
Pe << PaPe << Pa
DSSS-FD UWB for two bandsDSSS-FD UWB for two bands
Average over 1 µsF0=3.5 GHz & F1=4.5 GHz
PSD without filter
Bandwith 2 GHz
Stanislas Voinot, STANTEC7UWB4SN 04/11/05
Low power Receiver
Optimized architecture and microelectronic design Optimized architecture and microelectronic design
Chip size : 2 mm²Chip size : 2 mm²
Receiver chip picture
Stanislas Voinot, STANTEC8UWB4SN 04/11/05
Technical model
Integrated customer’s protocol stack
Proprietary radio interface (IRF) Open interface : IRF – Base Band
Protocol stack
Stanislas Voinot, STANTEC9UWB4SN 04/11/05
Product performances
TargetTargetCoexistence 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, STANTEC10UWB4SN 04/11/05
Test bench
Test bench realised with Tektronix DSO
Tektronix Technical Note - May 2005
( www.tektronix.com )
Stanislas Voinot, STANTEC11UWB4SN 04/11/05
UWB Front-End RF prototype
Stanislas Voinot, STANTEC12UWB4SN 04/11/05
Conclusion
A new UWB access technique was presentedA new UWB access technique was presented
This technique provides very good spectrum coverageThis technique provides very good spectrum coverage
Frequency diversity used in this technique allows a good Frequency diversity used in this technique allows a good robustness against narrow band blockersrobustness against narrow band blockers
PerspectivePerspective
ICs based in this technique are being developed by ICs based in this technique are being developed by STANTEC in low power CMOS technologySTANTEC in low power CMOS technology
Stanislas Voinot, STANTEC13UWB4SN 04/11/05
UWB Market
High Data High Data rate>100 rate>100
MbpsMbps
Low Data Rate (Low Data Rate (# WIFI)# WIFI)
1Kbps - 10 Mbps1Kbps - 10 Mbps
ApplicationsApplications
ExempleExemple
PCPC
USB wirelessUSB wireless
Outdoor Outdoor OPPNOPPN
Transducers Transducers SPINSPIN
Geoloc.Geoloc.
IndoorIndoor
Distance Distance < 10 m< 10 m > 1 Km> 1 Km 10< m <10010< m <100 300 m300 m
SupplySupply > 500 mW> 500 mW < 500 mW< 500 mW < 10 mW< 10 mW < 200 mW< 200 mW
Applications Applications FieldField
HomeHome
ProfessionalProfessional
HomeHome
ProfessionalProfessional
IndustrialIndustrial
ProfessionalProfessional
HomeHome
ProfessionalProfessional
