AcknowledgmentsReferences

1
A LOW POWER TRANSMITTER FOR IEEE 802.15.4
WIRELESS NETWORKS Mark Ferriss, Ivan Bogue, and
Prof. M. P. Flynn 1Center for Wireless
Integrated Microsystems, University of Michigan,
Ann Arbor, MI, USA



Transmitter Architecture
Transmitter Top level
IEEE 802.15.4 ZigbeeTM standard

• Designed for sensor networks
• Low power Relative of Bluetooth
• 50 Member Zigbee Alliance
• Motorola, Honeywell
• Data rate of 250 kb/s.
• Star or Peer-to-Peer operation.
• Support for low latency devices.
• Frequency Bands of Operation, either
• 16 channels in the 2.4GHz ISM band
• Or 10 channels in the 915MHz ISM band and 1
  channel in the European 868MHz band

Star or Peer-to-Peer Network configuration
Transmitter Scheme
Power lt 30mW
Range lt 100m
QPSK has more efficient power requirements
spectra compared against FSK.
Modulation O-QPSK
Data rate 250 Kb/s
Transmit freq. 2.4 Ghz
Transmitter
Process 0.13µm CMOS
courtesy of Motorola

Applications
Target markets for the 802.15.4 Standard include
industrial control and networking, home
automation and control, inventory management,
human interface devices, as well as wireless
sensor networks.
Output phase.
Transmit spectrum
APPLICATIONS
Wide bandwidth (2MHz) loop filter Fast response
but poor noise.
WIMS Sensor Cube
Narrow bandwidth Slow response with much
improved noise performance.
Acknowledgments/References The authors would like
to thank WIMS and its industrial partners. 1
Ian. Galton, Delta Sigma Data Conversion in
Wireless Transceivers, IEEE Transactions on
Microwave Theory and Techniques, vol. 50, No. 1,
January 2002 2 Prof. Michael H. Perrott, HSCS,
MIT