A Sub-0.01° Phase Resolution 6.8-mW fNIRS Readout Circuit Employing a Mixer-First Frequency-Domain Architecture

Chen, Cheng; Ma, Zhouchen; Liu, Yaxin; Liu, Zhenhong; Zhou, Linfeng; Wu, Yan; Qi, Liang; Li, Yongfu; Wang, Guoxing; Zhao, Jian

doi:10.1109/esscirc55480.2022.9911433

Cited by 1 publication

(1 citation statement)

References 11 publications

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“…Several works have aimed to improve wearable FD-NIRS system performance through system component integration and new signal processing schemes. In 2022, Chen et al [ 66 ] presented a FD-fNIRS measurement integrated circuit (IC). A mixer-first analog front-end (AFE) on IC was utilized for demodulation to reduce the system power, while an on-chip

phase-to-digital converter (PDC) was implemented to lower the laser modulation frequency while achieving a phase resolution of

.…”

Section: State-of-the-art Fd-nirs Technologiesmentioning

confidence: 99%

Review of recent advances in frequency-domain near-infrared spectroscopy technologies [Invited]

Zhou¹,

Xia

Uchitel

et al. 2023

Biomed. Opt. Express

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Over the past several decades, near-infrared spectroscopy (NIRS) has become a popular research and clinical tool for non-invasively measuring the oxygenation of biological tissues, with particular emphasis on applications to the human brain. In most cases, NIRS studies are performed using continuous-wave NIRS (CW-NIRS), which can only provide information on relative changes in chromophore concentrations, such as oxygenated and deoxygenated hemoglobin, as well as estimates of tissue oxygen saturation. Another type of NIRS known as frequency-domain NIRS (FD-NIRS) has significant advantages: it can directly measure optical pathlength and thus quantify the scattering and absorption coefficients of sampled tissues and provide direct measurements of absolute chromophore concentrations. This review describes the current status of FD-NIRS technologies, their performance, their advantages, and their limitations as compared to other NIRS methods. Significant landmarks of technological progress include the development of both benchtop and portable/wearable FD-NIRS technologies, sensitive front-end photonic components, and high-frequency phase measurements. Clinical applications of FD-NIRS technologies are discussed to provide context on current applications and needed areas of improvement. The review concludes by providing a roadmap toward the next generation of fully wearable, low-cost FD-NIRS systems.

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phase-to-digital converter (PDC) was implemented to lower the laser modulation frequency while achieving a phase resolution of

.…”

Section: State-of-the-art Fd-nirs Technologiesmentioning

confidence: 99%

Review of recent advances in frequency-domain near-infrared spectroscopy technologies [Invited]

Zhou¹,

Xia

Uchitel

et al. 2023

Biomed. Opt. Express

View full text Add to dashboard Cite

show abstract

A Sub-0.01° Phase Resolution 6.8-mW fNIRS Readout Circuit Employing a Mixer-First Frequency-Domain Architecture

Cited by 1 publication

References 11 publications

Review of recent advances in frequency-domain near-infrared spectroscopy technologies [Invited]

Review of recent advances in frequency-domain near-infrared spectroscopy technologies [Invited]

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