Recently, ZHAO Bo from the College of Information Science & Electronic Engineering published a paper entitled “A Low-Power Compact IEEE802.15.6 Compatible Human Body Communication Transceiver with Digital Sigma—Delta IIR Mask Shaping” in the IEEE Journal of Solid-State Circuits. ZHAO Bo is the leading author of this paper.  

The IEEE Journal of Solid-State Circuits publishes papers each month in the broad area of solid-state circuits with particular emphasis on transistor-level design of integrated circuits. It also provides coverage of topics such as circuit modeling, technology, systems design, layout, and testing that relate directly to IC design. Integrated circuits and VLSI are of principal interest. Since its inauguration in 1966, it has published roughly 12,300 papers, among which only about 50 papers are penned by scholars from mainland China.

To enhance the mask rejection below 2 MHz for effective human body communication (HBC), a new mask shaping technique is proposed for the HBC transmitter, where a digital sigma-delta modulated infinite impulse response (IIR) filter provides sufficient rejection with a digital-to-analog converter (DAC) of only 8 bits. A receiver with high input impedance is designed to improve sensitivity, and a digital calibration technique is employed to eliminate the DC-to-DC offset. The proposed techniques are implemented in 65nm CMOS process, and a sub-mm sized IEEE 802.15.6 compatible HBC transceiver is demonstrated. Measurements show that the transmitter achieves a rejection of -86.5 dBr at 2 MHz with a power consumption of 3.52 mW. Consuming 620 μW, the receiver achieves a sensitivity of -72 dBm at a chip rate of 5.25 Mcps and a bit error rate (BER) less than 10-7.