A Body Channel Communication Transceiver with a 16x Oversampling CDR and Convolutional Codes

Abstract

In this paper, a transceiver for human body channel (BCC) transmission is presented. BCC has the advantage of being less susceptible to interference from the external environment and consuming less power. First, the convolutional code encodes the data on the transmission side, and then the bit buffer and NRZI code are used to make the transmission more reliable, and the CRC32 code is inserted. On the receiver side, the proposed 16 times oversampling clock and data recovery (CDR) circuit recover the clock and data, and then the data are decoded by the Viterbi decoder. Finally, the correctness of the packet data is checked by the CRC32 code. The proposed BCC transceiver was implemented in TSMC 90nm CMOS process and can achieve a 5Mbps data rate with BER < 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−9</sup> with energy/bit 0.34nJ/b (TX) and 0.4654nJ/b (RX).