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• W4382365654 abstract "Peripheral nervous system (PNS) recording plays an essential role in the development of neural-controlled prosthetics. Compared to cortical recording, PNS requires front-end circuitry with lower input-referred noise and higher accuracy. A chopper-stabilized front-end with its transfer function set by precision capacitor ratios that meets these goals is introduced. Using a windowed integration sampling technique, the continuous-time anti-aliasing filter that usually precedes the lowpass switched-capacitor (SC) filter can be eliminated. High gain accuracy is achieved using a closed-loop switched-capacitor topology wherein a chopper-modulated <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>sinc</i> function is realized. The corner frequencies of the front-end are determined by a downstream switched-capacitor filter and a DC servo-loop-based SC integrator. The overall energy efficiency is further improved using correlated level shifting in the SC filter and integrator stages to simplify the operational amplifier topology. A positive feedback loop is also incorporated to increase the input impedance. The PNS front-end implemented in 180 nm CMOS has a gain of 58.1 dB and an integrated input-referred noise of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$2.2mu text{V}_{mathrm {rms}}$ </tex-math></inline-formula> over the -3 dB bandwidth from 170 Hz - 9.68 kHz; the input impedance is <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$>$ </tex-math></inline-formula> 61M <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$Omega $ </tex-math></inline-formula> @ 1 kHz. The total harmonic distortion is -66.6 dB with a 1.8V <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>pp</sub> output swing. The complete front-end including clock generation circuitry occupies 0.136 mm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> , draws <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$16.1 mu text{A}$ </tex-math></inline-formula> from a 1.8 V supply, and achieves a noise efficiency factor of 3.5." @default.
• W4382365654 created "2023-06-29" @default.
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• W4382365654 date "2023-08-01" @default.
• W4382365654 modified "2023-10-17" @default.
• W4382365654 title "A Chopper-Stabilized Switched-Capacitor Front-End for Peripheral Nervous System Recording" @default.
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• W4382365654 doi "https://doi.org/10.1109/tcsi.2023.3282555" @default.
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