Ultralow-Power Bioimpedance IC With Intermediate Frequency Shifting Chopper

Ko, Hyoungho; Lee, Takhyung; Kim, Ji-Hoon; Park, Jong-ae; Kim, Jong Pal

doi:10.1109/tcsii.2015.2483258

Cited by 41 publications

(24 citation statements)

References 8 publications

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“…In this work, the required bandwidth and power of the IA are reduced by pre-demodulating the BioZ signal to the chopping frequency (fchop) before it enters the core IA ( Fig. 10) [16]. The main problem of a demodulator is that is tends to reduce the input impedance while increasing the noise due to additional switch on-resistance (similarly as chopping).…”

Section: B Bio-impedance (Bioz) Modementioning

confidence: 99%

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A 36 μW 1.1 mm² Reconfigurable Analog Front-End for Cardiovascular and Respiratory Signals Recording

Konijnenburg

et al. 2018

IEEE Trans. Biomed. Circuits Syst.

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This paper presents a 1.2 V 36 μW reconfigurable analog front-end (R-AFE) as a general-purpose low-cost IC for multiple-mode biomedical signals acquisition. The R-AFE efficiently reuses a reconfigurable preamplifier, a current generator (CG), and a mixed signal processing unit, having an area of 1.1 mm2 per R-AFE while supporting five acquisition modes to record different forms of cardiovascular and respiratory signals. The R-AFE can interface with voltage-, current-, impedance-, and light-sensors and hence can measure electrocardiography (ECG), bio-impedance (BioZ), photoplethysmogram (PPG), galvanic skin response (GSR), and general-purpose analog signals. Thanks to the chopper preamplifier and the low-noise CG utilizing dynamic element matching, the R-AFE mitigates ${\text{1}}\text{/}f$ noise from both the preamplifier and the CG for improved measurement sensitivity. The IC achieves competitive performance compared to the state-of-the-art dedicated readout ICs of ECG, BioZ, GSR, and PPG, but with approximately 1.4×-5.3× smaller chip area per channel.

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Section: B Bio-impedance (Bioz) Modementioning

confidence: 99%

“…The main problem of a demodulator is that is tends to reduce the input impedance while increasing the noise due to additional switch on-resistance (similarly as chopping). To mitigate these effects, the IA's input chopper and the BioZ input modulator are merged into one block clocked by fMT=fBioZ-fchop [16].…”

Section: B Bio-impedance (Bioz) Modementioning

confidence: 99%

A 36 μW 1.1 mm² Reconfigurable Analog Front-End for Cardiovascular and Respiratory Signals Recording

Konijnenburg

et al. 2018

IEEE Trans. Biomed. Circuits Syst.

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“…However, sinusoidal oscillators tend to be power hungry [3], [26][27]. On the other hand, using a square signal instead of a sinusoid causes a significant error in the impedance measurement [9], [28]. A three-level injection signal is as easy…”

Section: Bio-impedance Measurementmentioning

confidence: 99%

Mixed-Signal IC With Pulse Width Modulation Wireless Telemetry for Implantable Cardiac Pacemakers in 0.18-μm CMOS

Rezaeiyan

Zamani

Shoaei

et al. 2018

IEEE Trans. Biomed. Circuits Syst.

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A low-power mixed-signal IC for implantable pacemakers is presented. The proposed system features three independent intracardiac signal readout channels with pulse-width-modulated outputs. Also, the proposed system is capable of measuring the amplitude and phase of the bioimpedance with pulse-width-modulated outputs for use in rate adaptive pacemakers. Moreover, a stimulation system is embedded, offering 16 different amplitudes from 1 to 7.8 V. A backscattering transmitter transfers the output signals outside the body with very little power consumption. The proposed low-power mixed-signal IC is fabricated in a 0.18-μm HV CMOS process and occupies 2.38 mm. The biopotential channels extract the heart signals with 9.2 effective number of bits and the bioimpedance channels measure the amplitude and phase of the heart impedance with 1.35 Ω accuracy. The complete IC consumes only 4.2 μA from a 1-V power supply.

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“…The frequency domain signal flow in an IFSC method is summarized in the right upper corner of Figure 6 [6]. The induced voltage signals (V ip<1> , V in<1> ) with the high-injection frequency are transferred to an intermediate frequency signal before amplification.…”

Section: Design Of Reconfigurable Afementioning

confidence: 99%

“…For example, an electropotential (EP) mode is used in applications including electrocardiogram (ECG), electromyogram (EMG), and electroencephalogram (EEG) [3,4,5]; impedance (IMP) mode is used for applications including body fat based on body impedance analysis [6,7], respiration rate [8,9], and galvanic skin response [10]; electrochemical (EC) mode is used in applications including blood glucose monitoring [11]; and photoelectric (PE) mode is used in applications including photoplethysmography (PPG) [12,13] and blood oxygen saturation [14,15]. Moreover, recently, as the requirements on integrated multifunctional biosignal acquisition systems are increasing, some research on multiparameter biosignal acquisition in a single system on a chip (SoC) have been reported [16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Multiparameter Biosignal Acquisition SoC for Low Power Wearable Platform

Kim

2016

Sensors

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A low power and low noise reconfigurable analog front-end (AFE) system on a chip (SoC) for biosignal acquisition is presented. The presented AFE can be reconfigured for use in electropotential, bioimpedance, electrochemical, and photoelectrical modes. The advanced healthcare services based on multiparameter physiological biosignals can be easily implemented with these multimodal and highly reconfigurable features of the proposed system. The reconfigurable gain and input referred noise of the core instrumentation amplifier block are 25 dB to 52 dB, and 1 μVRMS, respectively. The power consumption of the analog blocks in one readout channel is less than 52 μW. The reconfigurable capability among various modes of applications including electrocardiogram, blood glucose concentration, respiration, and photoplethysmography are shown experimentally.

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Ultralow-Power Bioimpedance IC With Intermediate Frequency Shifting Chopper

Cited by 41 publications

References 8 publications

A 36 μW 1.1 mm² Reconfigurable Analog Front-End for Cardiovascular and Respiratory Signals Recording

A 36 μW 1.1 mm² Reconfigurable Analog Front-End for Cardiovascular and Respiratory Signals Recording

Mixed-Signal IC With Pulse Width Modulation Wireless Telemetry for Implantable Cardiac Pacemakers in 0.18-μm CMOS

Reconfigurable Multiparameter Biosignal Acquisition SoC for Low Power Wearable Platform

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Ultralow-Power Bioimpedance IC With Intermediate Frequency Shifting Chopper

Cited by 41 publications

References 8 publications

A 36 μW 1.1 mm2 Reconfigurable Analog Front-End for Cardiovascular and Respiratory Signals Recording

A 36 μW 1.1 mm2 Reconfigurable Analog Front-End for Cardiovascular and Respiratory Signals Recording

Mixed-Signal IC With Pulse Width Modulation Wireless Telemetry for Implantable Cardiac Pacemakers in 0.18-μm CMOS

Reconfigurable Multiparameter Biosignal Acquisition SoC for Low Power Wearable Platform

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A 36 μW 1.1 mm² Reconfigurable Analog Front-End for Cardiovascular and Respiratory Signals Recording

A 36 μW 1.1 mm² Reconfigurable Analog Front-End for Cardiovascular and Respiratory Signals Recording