A CMOS MedRadio Transceiver With Supply-Modulated Power Saving Technique for an Implantable Brain-Machine Interface System
A CMOS MedRadio Transceiver With Supply-Modulated Power Saving Technique for an Implantable Brain-Machine Interface System
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DOI：
10.1109/jssc.2019.2899521
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发表时间：
2019-06-01
影响因子：
5.4
通讯作者：
Heydari, Payam
中科院分区：
文献类型：
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作者：
Lee, Mao-Cheng;Karimi-Bidhendi, Alireza;Heydari, Payam
介绍了一种用于180 nm CMOS工艺的植入式脑机接口（BMI）的MedRadio 413-419 MHz无电感收发器（TRX）。该开关键控（OOK）TRX芯片面积（包括焊盘环）为5.29 mm（2），采用非相干直接检波接收机（RX），实测带内噪声系数（NF）为4.9 dB，S-11为-13.5 dB。事件驱动电源调制（EDSM）技术的引入，以显着降低RX功耗。该接收器采用自适应反馈环路，在1/10 kbps数据速率下，1.8 V电源供电时功耗为42-/92 μ W，误码率为0.1%时灵敏度为-79/-74 dBm。TX采用具有自动频率校准环路的电流饥饿环形振荡器，覆盖9%的电源电压变化和15摄氏度至78摄氏度的温度范围，确保在发射屏蔽内运行。直接调制TX在-4-dBm输出功率下对随机OOK数据序列实现14%的效率。无线测试超过350厘米的距离占生物信号数据传输，多用户共存，并在体外幻影测量结果证明。
A MedRadio 413-419-MHz inductorless transceiver (TRX) for an implantable brain-machine interface (BMI) in a 180 nm-CMOS process is presented. Occupying 5.29 mm(2) of die area (including pad ring), this on-off keying (OOK) TRX employs a non-coherent direct-detection receiver (RX), which exhibits a measured in-band noise figure (NF) of 4.9 dB and S-11 of -13.5 dB. An event-driven supply modulation (EDSM) technique is introduced to dramatically lower the RX power consumption. Incorporating an adaptive feedback loop, this RX consumes 42-/92-mu W power from 1.8-V supply at 1/10-kbps data rates, achieving-79/-74-dBm sensitivities for 0.1% bit error rate (BER). The TX employs a current starved ring oscillator with an automatic frequency calibration loop, covering 9% supply voltage variation and 15 degrees C-78 degrees C temperature range that guarantees operation within the emission mask. The direct-modulation TX achieves 14% efficiency for a random OOK data sequence at -4-dBm output power. Wireless testing over a 350-cm distance accounting for bio-signal data transfer, multi-user coexistence, and in vitro phantom measurement results is demonstrated.