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首頁(yè)> 外文期刊>Solid-State Circuits, IEEE Journal of >Time-Divided Spread-Spectrum Code-Based 400 fW-Detectable Multichannel fNIRS IC for Portable Functional Brain Imaging
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Time-Divided Spread-Spectrum Code-Based 400 fW-Detectable Multichannel fNIRS IC for Portable Functional Brain Imaging

機(jī)譯:基于時(shí)分?jǐn)U頻碼的400 fW可檢測(cè)多通道fNIRS IC,用于便攜式功能性腦成像

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摘要

A custom tranceiver IC is designed to implement a portable brain imaging system based on functional near-infrared spectroscopy (fNIRS). The fNIRS IC generates multichannel time-divided spread-spectrum codes (TDSSCs) and drives light-emitting devices in the transmitter (Tx) chain, and performs optimum filtering, quantization, and serialization in the receiver (Rx) chain. A dual slope ADC subsequent to an operational transconductance amplifier-C-based matched filter shares a capacitor to save area while achieving optimum signal-to-noise ratio (SNR) in the brain channel. The Rx chain including an off-chip TIA ensures sufficient electrical SNR irrespective of the brain region for the accurate extraction of hemodynamic response. The minimum detectable light power of the Rx chain is 400 fW. The output power of the Tx is made adjustable by controlling the occurrence rate and the power of the TDSSC to reduce subject-dependent measurement variations. The proposed fNIRS system measures 42 brain regions simultaneously, and the experimental results clearly verify the validity of the proposed portable fNIRS system.
機(jī)譯:定制收發(fā)器IC被設(shè)計(jì)為實(shí)現(xiàn)基于功能近紅外光譜(fNIRS)的便攜式大腦成像系統(tǒng)。 fNIRS IC生成多通道時(shí)分?jǐn)U頻碼(TDSSC),并驅(qū)動(dòng)發(fā)射器(Tx)鏈中的發(fā)光設(shè)備,并在接收器(Rx)鏈中執(zhí)行最佳的濾波,量化和串行化。在基于跨導(dǎo)放大器-C的運(yùn)算濾波器匹配濾波器之后的雙斜率ADC共享一個(gè)電容器,以節(jié)省面積,同時(shí)在腦部通道中實(shí)現(xiàn)最佳信噪比(SNR)。包括片外TIA的Rx鏈可確保足夠的電SNR,而與大腦區(qū)域無(wú)關(guān),以準(zhǔn)確提取血液動(dòng)力學(xué)反應(yīng)。 Rx鏈的最小可檢測(cè)光功率為400 fW。通過(guò)控制TDSSC的發(fā)生率和功率,可以調(diào)整Tx的輸出功率,以減少與主體相關(guān)的測(cè)量變化。擬議的fNIRS系統(tǒng)可同時(shí)測(cè)量42個(gè)大腦區(qū)域,實(shí)驗(yàn)結(jié)果清楚地證明了擬議的fNIRS系統(tǒng)的有效性。

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