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Technique for Integration of a Wireless Switch in a 2.4 GHz Single Chip Radio

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2 Author(s)
Lerdsitsomboon, W. ; Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL, USA ; Kenneth, K.O.

Abstract-A technique for integrating a wireless switch into an M&M™ sized radio operating at 2.4 GHz that can turn a radio on or off is demonstrated using a 130-nm digital CMOS process. The switch circuit like a passive radio frequency identification system picks up an amplitude modulated 5.8-GHz carrier and converts it to DC to power up a portion of radio connected to a coin-cell battery. The radio uses a 2.4/5.8 GHz dual band antenna, and the wireless switch is added between the antenna, and transmit/receive (T/R) switch of the radio. By incorporating an input impedance transformation network, the wireless switch achieves input sensitivity of ~ -13 dBm. Inclusion of this circuit degrades the maximum transmitted power and sensitivity of 2.4-GHz transceiver by 0.3-0.5 dB. The RF clamp of wireless switch also limits the input power above ~ 12 dBm to protect the switch and transceiver. The wireless switch occupies an area of ~ 400 X 590 μm2.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:46 ,  Issue: 2 )