DAC Student Design Competition

1
DAC Student Design Competition
Picocube A 1cm3 Sensor Node Powered by
Harvested Energy Yuen-Hui Chee, Mike Koplow,
Michael Mark, Nathan Pletcher, Mike Seeman, Fred
Burghardt, Dan Steingart, Jan Rabaey, Paul
Wright, Seth Sanders
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Cube Anatomy
on a dime
radio COB die

• Stacked PCBs
• 1cm square

sensor board 1 top/bottom
switch/power board top/bottom
storage board top/blank bottom
uC board top/bottom
radio board top/bottom
sensor board 2 top/bottom
3
Custom Technology

• Custom PicoCube Transmitter w/ FBAR
• 10 kbps, 10 m range at 0 dBm
• Supports FSK modulation, but useful for OOK
• Custom 200O antenna, matching PA

• Power Management IC
• 2 switched-capacitor converters (0.7V, 2.1V)
• 84 efficient
• Synchronous Rectifier
• 88 efficient from shaker
• Ultra-low-power references and other circuitry