首页|A Nanopower Folded-Cascode EEG Lowpass Filter

A Nanopower Folded-Cascode EEG Lowpass Filter

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  • NETL
  • NSTL
  • IEEE
This brief presents a continuous-time lowpass biquadratic cell developed from a folded-cascode OTA operating in the subthreshold region. The proposed cell has been implemented by configuring the OTA in a unity-gain feedback manner and inserting two individual capacitors into the output and internal folding nodes. This allows the proposed biquadratic cell to benefit from the high loop gain that maintains good linearity at passband frequencies well below its cutoff. As an application of this biquadratic cell, a pseudo-differential lowpass filter for electroencephalogram detection is designed and implemented in a 0.18- $\mu $ m standard CMOS technology. The custom filter occupies a silicon area of $230~\mu $ m $\times 300~\mu $ m and operates from a 0.8-V dc supply with 7 nA total current consumption. Multi-chip measurements exhibit the average cut-off frequency at 151.2 Hz, input-referred noise of $35~\mu $ Vrms, and linear range of 110 mVP. This brief achieves the best FoM to date among recent relevant nano-power filters.

NoiseLow-pass filtersTransistorsCircuitsTransfer functionsCapacitorsBand-pass filtersCapacitanceTransconductorsCutoff frequency

Surachoke Thanapitak、Khanittha Kaewdang、Xiao Liu、Prajuab Pawarangkoon

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Faculty of Engineering, Mahidol University, Nakhon Pathom, Thailand

Department of Electrical and Electronic Engineering, Faculty of Engineering, Ubon Ratchathani University, Ubon Ratchathani, Thailand

State Key Laboratory of Integrated Chips and Systems, Fudan University, Shanghai, China|School of Information Science and Technology, Fudan University, Shanghai, China

Department of Electronic Engineering, Faculty of Engineering and Technology, Mahanakorn University of Technology, Bangkok, Thailand

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2025

10.1109/TCSII.2025.3545968

IEEE transactions on circuits and systems, Part II. Express briefs

IEEE transactions on circuits and systems, Part II. Express briefs

ISSN：
年,卷(期)：2025.72(5)
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