Publication

A 0.08mm2, 2Vpp-Input-Range, 95dB-SNDR, 178.5dB-FOMs Noise-Shaping SAR ADC for Closed-Loop Neural Interfaces

2026

Abstract

In closed-loop neural interfaces, simultaneous recording and stimulation impose significant challenges on the recording path, demanding a frontend capable of accommodating large amplitudes and a wide dynamic range. This paper presents a Noise-Shaping SAR ADC with large input amplitude and high dynamic range for closed-loop interfaces, featuring in-loop Serial-to-Parallel Amplification (SPA) and a fully dynamic Capacitor-Stacking-and-Buffering (CSB) integrator with a Fully Dynamic Voltage Buffer (FDVB). Fabricated in 65-nm CMOS, the proposed design achieves 2-Vpp input range, 95-dB SNDR, and 178.5-dB FOMs with only 2.26 µW within a compact 0.08 mm2 area. In-vitro experiments using pre-recorded neural data with stimulation artifacts demonstrate robust, artifact-resilient neural recording.

Official source

https://infoscience.epfl.ch/entities/publication/c4de1537-92eb-405e-ad77-c5949b66ba1f

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c4de1537-92eb-405e-ad77-c5949b66ba1f

About this result

Related concepts (32)

Dynamic range

Dynamic range (abbreviated DR, DNR, or DYR) is the ratio between the largest and smallest values that a certain quantity can assume. It is often used in the context of signals, like sound and light. It is measured either as a ratio or as a base-10 (decibel) or base-2 (doublings, bits or stops) logarithmic value of the difference between the smallest and largest signal values. Electronically reproduced audio and video is often processed to fit the original material with a wide dynamic range into a narrower recorded dynamic range that can more easily be stored and reproduced; this processing is called dynamic range compression.

High dynamic range

High dynamic range (HDR) is a dynamic range higher than usual, synonyms are wide dynamic range, extended dynamic range, expanded dynamic range. The term is often used in discussing the dynamic range of various signals such as s, videos, audio or radio. It may apply to the means of recording, processing, and reproducing such signals including analog and digitized signals. The term is also the name of some of the technologies or techniques allowing to achieve high dynamic range images, videos, or audio.

Brain–computer interface

A brain–computer interface (BCI), sometimes called a brain–machine interface (BMI) or smartbrain, is a direct communication pathway between the brain's electrical activity and an external device, most commonly a computer or robotic limb. BCIs are often directed at researching, mapping, assisting, augmenting, or repairing human cognitive or sensory-motor functions. They are often conceptualized as a human–machine interface that skips the intermediary component of the physical movement of body parts, although they also raise the possibility of the erasure of the discreteness of brain and machine.

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A 0.08mm<sup>2</sup>, 2V<sub>pp</sub>-Input-Range, 95dB-SNDR, 178.5dB-FOM<sub>s</sub> Noise-Shaping SAR ADC for Closed-Loop Neural Interfaces

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