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Abstract
Organic field-effect transistors (OFETs) are at the forefront of next generation electronics. This class of devices is particularly promising due to the possibility of fabrication on mechanically compliant and conformable substrates, and potential manufacturing at large scale through solution deposition techniques. However, their integration in circuits, especially using stretchable materials, is still challenging. In this work, the design and implementation of a novel structure for an integrated CMOS readout circuitry is presented and its fundamentals of operation are provided. Critical for sensing applications, the readout circuitry described is highly linear. Moreover, as several sources of mismatch and error are present in CMOS and OFET devices, a calibration technique is used to cancel out all the mismatches, thus delivering a reliable output. The readout circuit is verified in TSMC 0.18 μm CMOS technology. The maximum total power consumption in the proposed readout circuit is less than 571 μW, while fully loaded calibration circuit consumes a power less than 153 μW, making it suitable for sensors applications. Based on previously reported high mobility and stretchable semiconducting polymers, this new design and readout circuitry is an important step toward a broader utilization of OFETs and the design of stretchable sensors.
Highlights
Microelectronic systems have changed many aspects of human life
Organic materials have been investigated vastly and their functionality is proven in smart sensor applications, the design of an effective readout circuit for biosensors fabricated from organic thin film transistors, required to convert the output of the Organic field-effect transistors (OFETs) to appropriate format for the digital backbone processing unit, has remained an important challenge for various reasons
Organic semiconductors have low elastic modulus, interesting for the fabrication of skin-inspired stretchable and conformable devices. These unique features have resulted in the significant growth-rate of the use of organic materials in health care applications such as organic thin-film transistors (OTFTs) for biological marker detection, drug delivery, and neural recording and stimulation. (Adhikari and Majumdar, 2004; Isaksson et al, 2007; O’Connor et al, 2015; Schwartz et al, 2013; Irimia-Vladu, 2014; Liao et al, 2015)
Summary
Microelectronic systems have changed many aspects of human life. They have revolutionized data processing and telecommunications in volume and speed, which have provided solutions for complicated issues. One of the most important fields of application for OFETs is point-of-care (PoC) systems, in which the test system should be exposed to health indicator analytes The result of this exposure is a signal, which is amplified and transmitted to a digital processing unit, in which, appropriate responses are produced. Organic materials have been investigated vastly and their functionality is proven in smart sensor applications, the design of an effective readout circuit for biosensors fabricated from organic thin film transistors, required to convert the output of the OFET to appropriate format for the digital backbone processing unit, has remained an important challenge for various reasons. Ref Knopfmacher et al (2014) Roberts et al (2008) Roberts et al (2008) Lai et al (2013) Lee et al (2015) Ogunleye et al (2019) Faraji et al (2015)
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