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A 70-μW 1.35-mm 2 Wireless Sensor With 32 Channels of Resistive and Capacitive Sensors and Edge-Encoded PWM UWB Transceiver Y
提出一种用于电子皮肤的多通道无线传感器接口电路，采用CDMA-like方法同时记录电阻和电容传感器信号。
130nm CMOS, 70 µW, 1.35 mm², 0.87 pJ/Conversion-step per channel
无线传感器多通道接口电子皮肤CDMA-likePWM UWB
▸创新点1：CDMA-like多通道传感方法（方法创新）。该技术通过类似CDMA的编码方式，实现了16通道电阻传感器和16通道电容传感器的同步记录，显著提高了多通道传感的并行处理能力，降低了系统复杂度。
▸创新点2：边缘编码PWM UWB无线传输（电路创新）。采用边缘编码技术，PWM UWB发射器在时域中传输编码信号，即使在20%数据丢失的恶劣环境下，仍能恢复SNR高于70 dB的传感器数据，提升了传输可靠性。
▸创新点3：无需传感器节点数字化（系统创新）。通过PWM UWB发射器直接传输模拟信号，避免了传感器节点上的数字化过程，减少了数据传输量，提高了传感和无线传输的效率，系统功耗仅为70 µW。
▸创新点4：高能效设计（系统创新）。该传感器节点采用130-nm工艺制造，芯片面积仅为1.35 mm²，能量效率达到0.87 pJ/Conversion-step per channel，适用于低功耗电子皮肤应用。
Abstract
This article presents a wireless multi-channel sensor interface circuit for emerging e-skin applications. The proposed interface circuit uses a CDMA-like sensing method to simul- taneously record 16-channel resistive sensors and 16-channel capacitive sensors. The code-modulated multi-channel signals are conditioned and wirelessly transmitted through an edge-encoded pulsewidth-modulation ultra-wideband (PWM UWB) transmitter in the time domain. The PWM UWB transmitter eliminates the need for digitization on the sensor node, reducing the number of data to be sent. This improves the sensing and wireless transmission efficiency. With the proposed edge-encoding technique, the PWM UWB transmitter can recover the sensor data with SNR above 70 dB despite 20% data loss under a lossy environment. Fabricated in 130-nm technology, the wireless multi-channel sensor node occupies a die area of 1.35 mm 2 and consumes a power of 70 µW. It achieves an energy efficiency of 0.87 pJ/Conversion-step per channel.