A 70-μW 1.35-mm2 Wireless Sensor With 32 Channels of Resistive and Capacitive Sensors and Edge-Encoded PWM UWB Transceiver
| Autor: | Aaron Thean, Yuxuan Luo, Chun-Huat Heng, Yida Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Resistive touchscreen
Computer science business.industry Capacitive sensing ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS Transmitter Electrical engineering Data_CODINGANDINFORMATIONTHEORY Sensor node Wireless Electrical and Electronic Engineering Transceiver business Wireless sensor network Pulse-width modulation |
| Zdroj: | IEEE Journal of Solid-State Circuits. 56:2065-2076 |
| ISSN: | 1558-173X 0018-9200 |
| DOI: | 10.1109/jssc.2020.3030995 |
| Popis: | 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 mm2 and consumes a power of 70 $\mu \text{W}$ . It achieves an energy efficiency of 0.87 pJ/Conversion-step per channel. |
| Databáze: | OpenAIRE |
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