A 540-mu W Duty Controlled RSSI With Current Reusing Technique for Human Body Communication

作者：Jang Jaeeun^*; Lee Yongsu; Cho Hyunwoo; Yoo Hoi Jun

来源：IEEE Transactions on Biomedical Circuits and Systems, 2016, 10(4): 893-901.

DOI：10.1109/TBCAS.2016.2579166

• Body channel communication (BCC)
• current reusing technique
• human body communication (HBC)
• low power
• received signal strength indicator (RSSI)
• wireless body area network (WBAN)

An ultra-low-power duty controlled received signal strength indicator (RSSI) is implemented for human body communication (HBC) in 180 nm CMOS technology under 1.5 V supply. The proposed RSSI adopted 3 following key features for low-power consumption; 1) current reusing technique (CR-RSSI) with replica bias circuit and calibration unit, 2) duty controller, and 3) reconfigurable gm-boosting LNA. The CR-RSSI utilizes stacked amplifier-rectifier-cell (AR-cell) to reuse the supply current of each blocks. As a result, the power consumption becomes 540 mu W with +/-2 dB accuracy and 75 dB dynamic range. The replica bias circuit and calibration unit are adopted to increase the reliability of CR-RSSI. In addition, the duty controller turns off the RSSI when it is not required, and this function leads 70% power reduction. At last, the g(m)-boosting reconfigurable LNA can adaptively vary its noise and linearity performance with respect to input signal strength. Fro current reusing technique m this feature, we achieve 62% power reduction in the LNA. Thanks to these schemes, compared to the previous works, we can save 70% of power in RSSI and LNA.

• 出版日期2016-8