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A 60 kb/s–10 Mb/s Adaptive Frequency Hopping Transceiver for Interference-Resilient Body Channel Communication

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4 Author(s)
Namjun Cho ; Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon ; Long Yan ; Joonsung Bae, ; Hoi-Jun Yoo

An interference-resilient 60 kb/s-10 Mb/s body channel transceiver using the human body as a signal transmission medium is designed for multimedia and medical data transaction in body-area network. The body antenna effect which interferes with signals in the human body channel is examined. The body-induced interferences degrade the SIR of the signal to -22 dB in the worst case. In order to overcome the body antenna effect, a 4-channel adaptive frequency hopping scheme using the 30-120 MHz band is introduced to the body channel transceiver. A direct-switching modulator using dual frequency synthesizers and a DLL-based demodulator are proposed for 10 Mb/s FSK and the 4.2 mus hopping time. The transceiver fabricated with 0.18 mum CMOS withstands -28 dB SIR and its operating distance is over 1.8 m with - 25 dB SIR. Its energy consumption is 0.37 nJ/b with -65 dBm sensitivity.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:44 ,  Issue: 3 )

Date of Publication:

March 2009

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