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  4. Noise efficient integrated amplifier designs for biomedical applications
 
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Noise efficient integrated amplifier designs for biomedical applications

Citation Link: https://doi.org/10.15480/882.4304
Publikationstyp
Journal Article
Date Issued
2021-06-23
Sprache
English
Author(s)
Simmich, Sebastian  
Bahr, Andreas  
Rieger, Robert  
TORE-DOI
10.15480/882.4304
TORE-URI
http://hdl.handle.net/11420/12315
Journal
Electronics  
Volume
10
Issue
13
Article Number
1522
Citation
Electronics 10 (13): 1522 (2021-06-23)
Publisher DOI
10.3390/electronics10131522
Scopus ID
2-s2.0-85108366831
Publisher
MDPI
The recording of neural signals with small monolithically integrated amplifiers is of high interest in research as well as in commercial applications, where it is common to acquire 100 or more channels in parallel. This paper reviews the recent developments in low-noise biomedical amplifier design based on CMOS technology, including lateral bipolar devices. Seven major circuit topology categories are identified and analyzed on a per-channel basis in terms of their noise-efficiency factor (NEF), input-referred absolute noise, current consumption, and area. A historical trend towards lower NEF is observed whilst absolute noise power and current consumption exhibit a widespread over more than five orders of magnitude. The performance of lateral bipolar transistors as amplifier input devices is examined by transistor-level simulations and measurements from five different prototype designs fabricated in 180 nm and 350 nm CMOS technology. The lowest measured noise floor is 9.9 nV/√ Hz with a 10 µA bias current, which results in a NEF of 1.2.
Subjects
Chopper stabilized
CMOS
Current reuse
Folded-cascode
Inverter based
Lateral BJT
Low noise
Low power
Multistage
NEF
Noise efficiency
OTA
DDC Class
600: Technik
More Funding Information
This work was funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) through the collaborative Research Centre CRC 1261 “Magnetoelectric Sensors: From Composite Materials to Biomagnetic Diagnostics” via the project A4.
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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