Recent Trends for (Bio)Chemical Impedance Sensor Electronic Interfaces

Crescentini, Marco; Bennati, Marco; Tartagni, Marco

doi:10.1002/elan.201100547

Cited by 12 publications

(9 citation statements)

References 32 publications

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“…Typical nanowire resistance is in the range of 100 kΩ to 100 MΩ [ 5 , 6 , 8 , 19 , 38 , 39 , 40 ] so that the currents are of the order of tens to hundreds of nA. Our measurement system is a portable test board that implements a two electrode potentiostat with a lock-in measurement technique for complex impedance detection as described in previous section [ 41 ].…”

Section: Methodsmentioning

confidence: 99%

AC and Phase Sensing of Nanowires for Biosensing

et al. 2016

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Silicon nanowires are label-free sensors that allow real-time measurements. They are economical and pave the road for point-of-care applications but require complex readout and skilled personnel. We propose a new model and technique for sensing nanowire sensors using alternating currents (AC) to capture both magnitude and phase information from the sensor. This approach combines the advantages of complex impedance spectroscopy with the noise reduction performances of lock-in techniques. Experimental results show how modifications of the sensors with different surface chemistries lead to the same direct-current (DC) response but can be discerned using the AC approach.

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Section: Methodsmentioning

confidence: 99%

AC and Phase Sensing of Nanowires for Biosensing

et al. 2016

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“…An advantage of this solution is that a digital signal is produced and no further filtering is required. Another mixed analog-digital approach based on a pass-band delta-sigma ADC is sketched in [185], while all-digital demodulation solutions can be obtained by processing the digitized EIS interface response in the digital domain to calculate the single-frequency the Discrete Fourier Transform (DFT). Such a solution [186] represents an FFT/FRA hybrid approach and allows for relaxed DSP requirements with respect to pure FFT based approaches, but sinusoidal excitation and the execution of a frequency scan are necessary as in FRA.…”

Section: Stimulusmentioning

confidence: 99%

CMOS Interfaces for Internet-of-Wearables Electrochemical Sensors: Trends and Challenges

et al. 2019

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Smart wearables, among immediate future IoT devices, are creating a huge and fast growing market that will encompass all of the next decade by merging the user with the Cloud in a easy and natural way. Biological fluids, such as sweat, tears, saliva and urine offer the possibility to access molecular-level dynamics of the body in a non-invasive way and in real time, disclosing a wide range of applications: from sports tracking to military enhancement, from healthcare to safety at work, from body hacking to augmented social interactions. The term Internet of Wearables (IoW) is coined here to describe IoT devices composed by flexible smart transducers conformed around the human body and able to communicate wirelessly. In addition the biochemical transducer, an IoW-ready sensor must include a paired electronic interface, which should implement specific stimulation/acquisition cycles while being extremely compact and drain power in the microwatts range. Development of an effective readout interface is a key element for the success of an IoW device and application. This review focuses on the latest efforts in the field of Complementary Metal–Oxide–Semiconductor (CMOS) interfaces for electrochemical sensors, and analyses them under the light of the challenges of the IoW: cost, portability, integrability and connectivity.

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“…Impedance-based sensors, detecting and measuring samplesunder-tests response under AC signals, have been gaining popularity for biological sensing in recent years 20 . These sensors are now widely applied in detections of various scales, e.g.…”

Section: Introductionmentioning

confidence: 99%