Chenxin Zhu

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Ph.D, Chinese Academy of Sciences, Institute of Microelectronics, with Prof. Ming Liu, 2012

Email: cxzhu AT stanford DOT edu

Stretchable Smart Sensor System

Stretchable electronics has drawn remarkable research interest for potential applications in wearable physiological monitoring and diagnosing [1], electronic skins for prosthesis and soft robotics [2], and human-machine interfaces [3].

As most mixed-signal electronic systems, the stretchable smart sensor system can be divided into three main sections [4] – the analog transducer that acquires and converts physical information to electrical outputs, the analog signal processing circuits, and the digital signal processer (Figure 1).

My research focuses on developing stretchable sensors that can conformably adhere with human skin or tissues for collecting reliable data free from motion artefacts. An ideal stretchable sensor is expected to be sensitive only to the measurand, while in practice, it will suffer from cross-sensitivities with strain or other physical parameters. To reduce the effect of cross-sensitivity on the accuracy of the sensor output, it is beneficial to process the sensing signal locally and realize correction of the output. A local amplifier with strain-insensitive performance is also desirable for the weak analog signal from the sensor. The circuit design for conventional smart sensors has been introduced to realize the robust stretchable sensors with the fabrication platform of stretchable and flexible electronics. Considering the circuit complexity, the mixed signal processing part will be developed by CMOS chips [5]. The stretchable smart sensor system will be demonstrate with the developed stretchable sensors and interface electronics.


Figure 1. Stretchable smart sensor system 

[1] D.-H. Kim et al., Epidermal electronics. Science 2011, 333, 838-843.
[2] B. C. K. Tee et al., A skin-inspired organic digital mechanoreceptor. Science 2015, 350, 313-316.
[3] S. Lee et al., A strain-absorbing design for tissue–machine interfaces using a tunable adhesive gel. Nature communications 2014, 5.
[4] W. Xiong, Analog signal processing circuits in organic transistor technology, 2010.
[5] W. Gao et al., A fully integrated wearable sensor arrays for multiplexed in situ perspiration analysis. Nature 2016, 529, 509-514.

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