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A TDMA baseband design for physiological signal transmission application in 0.18-μm CMOS technology

This article describes a low complexity digital time division multiple access (TDMA) baseband design for multi-biosensor nodes to a central processing node communication. The proposed communication protocol is achieved by introducing the control codes of tag/data type and the bit error rate (BER) is reduced by using the central read technology. A digital timing synchronization circuit is also proposed to achieve clock synchronization between biosensor nodes. The proposed TDMA baseband is fabricated successfully in a 0.18-μm CMOS process and designed with verilog HDL. With transmission data rate of 4Mbps based on 64MHz system clock and a 1.8 supply, the proposed baseband chips consume total 1.132mW which contains 680uW for biosensor node and 452uW for central processing node.