Cited by 1,695Analog and Mixed-Signal Circuit DesignRadio Frequency Integrated Circuit DesignLow-power high-performance VLSI design

A low-power low-noise cmos for amplifier neural recording applications

Harrison, R.R., Charles, C.·2003·IEEE Journal of Solid-State Circuits

Abstract

There is a need among scientists and clinicians for low-noise low-power biosignal amplifiers capable of amplifying signals in the millihertz-to-kilohertz range while rejecting large dc offsets generated at the electrode-tissue interface. The advent of fully implantable multielectrode arrays has created the need for fully integrated micropower amplifiers. We designed and tested a novel bioamplifier that uses a MOS-bipolar pseudoresistor element to amplify low-frequency signals down to the millihertz range while rejecting large dc offsets. We derive the theoretical noise-power tradeoff limit - the noise efficiency factor - for this amplifier and demonstrate that our VLSI implementation approaches this limit by selectively operating MOS transistors in either weak or strong inversion. The resulting amplifier, built in a standard 1.5-μm CMOS process, passes signals from 0.025Hz to 7.2 kHz with an input-referred noise of 2.2 μVrms and a power dissipation of 80 μW while consuming 0.16 mm2of chip area. Our design technique was also used to develop an electroencephalogram amplifier having a bandwidth of 30 Hz and a power dissipation of 0.9 μW while maintaining a similar noise-power tradeoff.

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Registry

Crossref · 10.1109/jssc.2003.811979

Cites

32 of 32 references verified0 citation errors · 0 not checkable

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  • A common ac-coupled bioamplifier uses capacitive feedback to accurately set the midband gain as a ratio of the input and feedback capacitors (C_I/C_F).

    “A common ac-coupled bioamplifier, shown in Fig. 6(a), uses capacitive feedback to accurately set the midband gain as a ratio of the input and feedback capacitors ( C I /C F ) [168].”
  • In biopotential amplifier applications, necessary highly resistive values can range up to tens of MΩ.

    “which can range up to tens of M Ω in biopotential amplifier applications [168].”
  • Discrete alternatives require large silicon area to achieve necessary high resistance values.

    “It is preferable to implement highly resistive elements with transistors compared to their discrete alternatives due to the large silicon area required to achieve the necessary values”
  • Previous studies using either a symmetrical cascode OTA or a 2-stage Miller OTA reported NEFs ranging from 4 to 17.

    “Indeed, previous studies [53, 98, 128], which used either a symmetrical cascode OTA or a 2-stage Miller OTA, reported NEFs ranging from 4 to 17.”
  • The most common way to record neural signals is to add a low noise amplifier (LNA) to the front end and then add digital quantization circuits.

    “The most common way is to add a low noise amplifier (LNA) to the front end of the recording (Harrison and Charles, 2003; Harrison et al., 2007) and then to add the digital quantization circuits (Zou et al., 2009; Liu et al., 2017; Yu et al., 2018).”

    From Advances in Neural Recording and Stimulation Integrated Circuits (2021) · cites this paper as Harrison and Charles, 2003

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Authors
Harrison, R. R., & Charles, C.
Affiliations
University of Utah (US)
Venue
IEEE Journal of Solid-State Circuits
Published
2003-06
Volume
38
Issue
6
Pages
958-965
ISSN
0018-9200 (ISSN-L)
OpenAlex
W2159318368
Cited by
1,695
References
33
Citations by year
2026: 41 · 2025: 55 · 2024: 71 · 2023: 71 · 2022: 74 · 2021: 118 · 2020: 82 · 2019: 80 · 2018: 93 · 2017: 86 · 2016: 90 · 2015: 90 · 2014: 85 · 2013: 80 · 2012: 82
FWCI
24.78
Type
journal article
Language
en
Open access
closed
Locations
IEEE Journal of Solid-State Circuits (publishedVersion)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Analog and Mixed-Signal Circuit Design
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Radio Frequency Integrated Circuit Design
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Low-power high-performance VLSI design
Keywords
neural recording, DC offset rejection, noise efficiency factor, weak and strong inversion, VLSI design

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