期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 55, 期 5, 页码 1361-1373出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2019.2949232
关键词
Capacitance-to-digital converter (CDC); capacitive sensor array; electronic skin (e-skin); multi-channel sensor interface circuits; pressure sensors
资金
- NUS Hybrid-Integrated Flexible (Stretchable) Electronic Systems Program (HiFES) program, through the LAkSA: Large-Area Skin-Conformable Natural Interfaces in Self-Aligning Polymer Platform Project [R263-501-011-133]
- Singapore's National Research Foundation [NRF-RSS2015-003]
- E6Nanofab, National University of Singapore
This article presents a multi-channel capacitance-todigital converter (CDC) circuits using the continuous-time Walsh coding multiplexing. The proposed circuits modulate the input capacitive sensors with orthogonal codes, enable simultaneous read-in of 16 capacitive sensors, and provide the combined 16 digitized outputs in a single conversion. By correlating 16 successive digitized outputs with the corresponding orthogonal codes in post-processing, the 16 capacitive channels can then be demodulated separately. The proposed continuous-time Walsh coding modulation preserves temporal information with minimum circuitry duplication and bandwidth requirement. This chip is fabricated in 130-nm CMOS technology and occupies an area of 0.14 mm2. With a reference clock of 4 MHz, the proposed multi-channel CDC achieves 11.4 ENOB with an average conversion time of 482 mu s. It consumes 0.51 mu W/channel and achieves an FoM of 87 fJ/conversion step.
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