A CMOS low-power polar demodulator for electrical bioimpedance spectroscopy using adaptive self-sampling schemes

Kweon, Soon-Jae; Shin, Seungyong; Park, Jeong-Ho; Suh, Jung Keun; Yoo, Hyung-Joun

doi:10.1109/biocas.2016.7833787

Cited by 12 publications

(23 citation statements)

References 11 publications

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“…However, the method might have limitations if the load changes its semi ramp shape, and this limits the bandwidth and capacitance range over which it can operate. In [24], the method locates the 4 1 Magnitude and phase detection. 2 Time to digital demodulation.…”

Section: Comparison and Discussionmentioning

confidence: 99%

“…The time window selected is narrow which leads to a complex circuit implementation [25]. Both [24] and [25] are simulation results and excluded from Table I. Lastly, the time stamp method is able to demodulate with less demands on the second-stage gain amplifier, which often requires additional calibration to accommodate different gains/phase delays at different frequencies.…”

Section: Comparison and Discussionmentioning

confidence: 99%

“…&'( is directly related to the excitation current. Note that a second acquisition channel implemented in [18], [24] measuring a dummy resistor to obtain a reference can be avoided.…”

Section: System Architecturementioning

confidence: 99%

“…For such small implantable devices including, for example, implantable impedimetric biosensors for monitoring blood biomarkers, an optimal design for demodulation will require minimal power consumption and an output signal that can be easily transmitted by a simple inductive link, for example, using impedance modulation. Several time-to-digital demodulation methods have been proposed but have limitations such as a narrow bandwidth [23] or rather complex circuitry [24], [25].…”

Section: Introductionmentioning

confidence: 99%

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Time Stamp – A Novel Time-to-Digital Demodulation Method for Bioimpedance Implant Applications

Jiang

Habibollahi

et al. 2020

IEEE Trans. Biomed. Circuits Syst.

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Bioimpedance analysis is a non-invasive and inexpensive technology to investigate the electrical properties of biological tissues. The analysis requires demodulation to extract the real and imaginary parts of the impedance. Conventional systems use complex architectures such as I-Q demodulation. In this paper, a very simple alternative time-to-digital demodulation method or 'time stamp' is proposed. It employs only three comparators to identify or stamp in the time domain, the crossing points of the excitation signal and the measured signal. In a CMOS proof of concept design, the accuracy of impedance magnitude and phase is 97.06% and 98.81% respectively over a bandwidth of 10 kHz to 500 kHz. The effect of fractional-N synthesis is analysed for the counter-based zero crossing phase detector obtaining a finer phase resolution (0.51˚ at 500 kHz) using a counter clock frequency (= 12.5 MHz). Because of its circuit simplicity and ease of transmitting the time stamps, the method is very suited to implantable devices requiring low area and power consumption.

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Section: Comparison and Discussionmentioning

confidence: 99%

Section: Comparison and Discussionmentioning

confidence: 99%

“…&'( is directly related to the excitation current. Note that a second acquisition channel implemented in [18], [24] measuring a dummy resistor to obtain a reference can be avoided.…”

Section: System Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Time Stamp – A Novel Time-to-Digital Demodulation Method for Bioimpedance Implant Applications

Jiang

Habibollahi

et al. 2020

IEEE Trans. Biomed. Circuits Syst.

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“…Instead of I/Q demodulation, the MPD systems employs simple peak and zero-crossing detection circuits [3], [13], [14]. The MPD system from [3], which is shown in Fig.…”

Section: Mpd Approachmentioning

confidence: 99%

Impedance spectroscopy systems: Review and an all-digital adaptive IIR filtering approach

Ivanisevic

Rodriguez

Rusu

2017

2017 IEEE Biomedical Circuits and Systems Conference (BioCAS)

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Impedance spectroscopy is a low-cost sensing technique that is generating considerable interest in wearable and implantable biomedical applications since it can be efficiently integrated on a single microchip. In this paper, the fundamental characteristics of the most well-known system architectures are presented, and a more robust and hardware-efficient solution is proposed. An all-digital implementation based on adaptive filtering is used for identifying the impedance parameters of a sampleunder-test. The coefficients of an infinite-impulse-response (IIR) filter are tuned by an adaptive algorithm based on pseudo-linear regression and output-error formulation. A three-level pseudorandom noise generator with a concave power spectral density is employed without deteriorating the nominal performance. Proofof-concept has been verified with behavioral simulations.

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A Sinusoidal Signal Generator Using a Constant Gain Finite Impulse Response (FIR) Filter for Electrical Bioimpedance Spectroscopy

Kweon

Suh

et al. 2018

2018 IEEE International Symposium on Circuits and Systems (ISCAS)

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A CMOS low-power polar demodulator for electrical bioimpedance spectroscopy using adaptive self-sampling schemes

Cited by 12 publications

References 11 publications

Time Stamp – A Novel Time-to-Digital Demodulation Method for Bioimpedance Implant Applications

Time Stamp – A Novel Time-to-Digital Demodulation Method for Bioimpedance Implant Applications

Impedance spectroscopy systems: Review and an all-digital adaptive IIR filtering approach

A Sinusoidal Signal Generator Using a Constant Gain Finite Impulse Response (FIR) Filter for Electrical Bioimpedance Spectroscopy

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