A 0.28mΩ-sensitivity 105dB-dynamic-range electrochemical impedance spectroscopy soc for electrochemical gas detection

Qu, Guangyang; Wang, Hanqing; Yu, Zhao; O’Donnell, J. M.; Lyden, C.; Liu, Yincai; Ding, Junbiao; Dempsey, Dennis; Chen, Leicheng; Bourke, Donal; Shurong, Gu; Gao, Jun; Liu, Lu; Wang, Li; Li, Xuemin; Li, Hongxing; Chu, Chao; Yang, Ling

doi:10.1109/isscc.2018.8310296

Cited by 14 publications

(9 citation statements)

References 2 publications

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“…For the generation of DAC-based sinusoids, direct digital synthesizers (DDSs) are widely used in on-chip EIS systems [35], [36], [39], [47], [48]. Fig.…”

Section: A Dac-based Sinusoidmentioning

confidence: 99%

“…CT filters have been widely adopted in on-chip SSGs [35], [36], [38], [39], [44], [45], [47], [51], [52], [59], [62], [63], [73], [101], [102]. The most simple but fundamental CT filter is passive RC LPFs.…”

Section: A Linearity Enhancement In Ct Domainmentioning

confidence: 99%

“…Attenuation of this harmonic over such a wide range can be done by changing the cut-off frequency of the LPF according to f SG . In contrast, a constant f S can be used with a high OSR while covering a range of f SG as in [35]. Then, the sampling harmonics are located near the fixed f S , so the cutoff frequency of the LPF can be fixed.…”

Section: A Linearity Enhancement In Ct Domainmentioning

confidence: 99%

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On-Chip Sinusoidal Signal Generators for Electrical Impedance Spectroscopy: Methodological Review

Kweon¹,

Rafi

Cheon

et al. 2022

IEEE Trans. Biomed. Circuits Syst.

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This paper reviews architectures and circuit implementations of on-chip sinusoidal signal generators (SSGs) for electrical impedance spectroscopy (EIS) applications. In recent years, there have been increasing interests in on-chip EIS systems, which measure a target material's impedance spectrum over a frequency range. The on-chip implementation allows EIS systems to have low power and small form factor, enabling various biomedical applications. One of the key building blocks of on-chip EIS systems is on-chip SSG, which determines the frequency range and the analysis precision of the whole EIS system. On-chip SSGs are generally required to have high linearity, wide frequency range, and high power and area efficiency. They are typically composed of three stages in general: waveform generation, linearity enhancement, and current injection. First, a sinusoidal waveform should be generated in SSGs. The generated waveform's frequency should be accurately adjustable over a wide range. The firstly generated waveform may not be perfectly linear, including unwanted harmonics. In the following linearity-enhancement step, these harmonics are attenuated by using filters typically. As the linearity of the waveform is improved, the precision of the EIS system gets ensured. Lastly, the filtered voltage waveform is now converted to a current by a current driver. Then, the current sinusoidal signal is injected into the target impedance. This review discusses the principles, advantages, and disadvantages of various techniques applied to each step in state-of-the-art on-chip SSGs. In addition, state-of-the-art designs are compared and summarized.

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“…For the generation of DAC-based sinusoids, direct digital synthesizers (DDSs) are widely used in on-chip EIS systems [35], [36], [39], [47], [48]. Fig.…”

Section: A Dac-based Sinusoidmentioning

confidence: 99%

Section: A Linearity Enhancement In Ct Domainmentioning

confidence: 99%

Section: A Linearity Enhancement In Ct Domainmentioning

confidence: 99%

See 1 more Smart Citation

On-Chip Sinusoidal Signal Generators for Electrical Impedance Spectroscopy: Methodological Review

Kweon¹,

Rafi

Cheon

et al. 2022

IEEE Trans. Biomed. Circuits Syst.

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show abstract

“…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. As an alternative to extracting the I and Q components, separate magnitude and phase estimation has been demonstrated to be feasible [187].…”

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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“…For electrochemical gas sensors, they determine gas concentrations by oxidizing or reducing the target gas at an electrode and measuring the resulting current . Although the electrochemical gas sensors can detect chemical molecules with an ultralow concentration, failure modes are usually difficult to be known in such devices . Moreover, similar to semiconductor gas sensors, electrochemical gas sensors are low cost but suffer from selectivity issues, which may be overcomed by using multiplexing and artificial intelligence (AI) techniques.…”

mentioning

confidence: 99%

On-Chip Optical Gas Sensors Based on Group-IV Materials

Yue

Chen

et al. 2020

ACS Photonics

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Compact and smart optical gas sensors have attracted significant attention over the past few decades. Among the materials used for developing such gas sensors, group-IV materials, including silicon, germanium, carbon allotropes, and their compounds, are considered the most promising candidates. By virtue of their inherent compatibility with the CMOS fabrication process in the mature microelectronics industry, onchip optical gas sensors based on group-IV materials have merits of appreciable sensitivity and high-density integration. Moreover, such sensors have promising potential to be integrated with other electronic or photonic devices for on-chip signal processing and communication, which are expected to enable versatile applications in the internet of things, point-of-care testing, and information and communication technology. This paper is the review of basic principles, state-of-the-art devices, and cutting-edge applications of on-chip optical gas sensors based on group-IV materials and discussions of their prospects.

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A 0.28mΩ-sensitivity 105dB-dynamic-range electrochemical impedance spectroscopy soc for electrochemical gas detection

Cited by 14 publications

References 2 publications

On-Chip Sinusoidal Signal Generators for Electrical Impedance Spectroscopy: Methodological Review

On-Chip Sinusoidal Signal Generators for Electrical Impedance Spectroscopy: Methodological Review

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

On-Chip Optical Gas Sensors Based on Group-IV Materials

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