期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 56, 期 7, 页码 2065-2076出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2020.3030995
关键词
Pulse width modulation; Wireless communication; Wireless sensor networks; Sensor arrays; Capacitance; Capacitors; Capacitive sensor array; electronic-skin; multi-channel sensor interface circuits; proximity sensor; PWM UWB; resistive sensor array; temperature sensor
资金
- Singapore National Research Foundation [R263-501-011-133]
- Hundred Talent Plan of Zhejiang University [NRF-RSS2015-003]
This article presents a wireless multi-channel sensor interface circuit using a CDMA-like sensing method to record both resistive and capacitive sensors, transmitting wirelessly through a PWM UWB transmitter with edge-encoding technique to achieve a high SNR. The fabricated sensor node is energy efficient with a die area of 1.35 mm(2) and consumes 70 mu W power.
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 simultaneously 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 mu W. It achieves an energy efficiency of 0.87 pJ/Conversion-step per channel.
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