A wideband current source for System-on-Chip Bio-Impedance Spectroscopy using a CCII drive and Pseudo-Resistor feedback

Chung, Wen-Yaw; Silverio, Angelito A.; Chang, Sheng-Hsiung; Zhou, Ming-Ying; Tsai, Vincent F.S.

doi:10.1109/isbb.2015.7344935

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…Therefore, the design of CMOS technology-based current sources is becoming more popular in recent years, which has the advantages of less power consumption, smaller package, and higher performance. A CCII-based current source was designed in TSMC 0.18 mm CMOS implementation at 1.3 V power supply, whose bandwidth can reach 73.5 MHz with a phase shift of 1.31°measured at the X-terminal and its output impedance measured at the Z-terminal is 898 kΩ at 50 kHz [19]. Similar OTA-based current sources were designed in 0.3 μm CMOS technology at±1.5 V power supplies, in which the designed class-A OTA circuit has an output impedance of 2.8 MΩ at 5 kHz and around 700 kΩ at 1 MHz, and the designed class-AB OTA circuit has an output impedance of 70.8 MΩ at 5 kHz and decreases to approximately 2.8 MΩ at 1 MHz [7].…”

Section: Experiments and Resultsmentioning

confidence: 99%

Wideband mirrored current source design based on differential difference amplifier for electrical bioimpedance spectroscopy

Zhang¹,

Teng²,

Zhong³

et al. 2018

Biomed. Phys. Eng. Express

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Wideband current sources that can work stable over a wide frequency range with large load variations are critical for the performance of electrical impedance spectrum (EIS) measurements. In this paper, we design a wideband mirrored current source (MCS) using two simple differential difference amplifiers (DDA) AD830. PSpice simulation and measurement were performed on load resistances from 100 Ω to 1500 Ω over the frequencies up to 1 MHz. The maximum variation of the output current is less than 0.5% over the whole bandwidth and the output impedance is 4.2 MΩ at 100 Hz and greater than 185 kΩ at 1 MHz. Moreover, less than 1% linearity error (the V IN versus the I OUT ) of the output current I OUT from 1 mA to 20 mA was achieved by sweeping the input voltage signal V IN from 0.1 V to 2 V at 100 Hz, 1 kHz and 10 kHz respectively. The DDA-based wideband MCS has high accuracy, linearity and simple structure, which may improve the performance of EIS measurements and other relevant applications.

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Section: Experiments and Resultsmentioning

confidence: 99%

Wideband mirrored current source design based on differential difference amplifier for electrical bioimpedance spectroscopy

Zhang¹,

Teng²,

Zhong³

et al. 2018

Biomed. Phys. Eng. Express

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“…However, if the leakage current value at the terminals (V A and V B ) of the instrumentation amplifier is known, then, the variation in the instrumentation amplifier can be compensated. This compensation technique is adopted by the authors in [49,50]. Author [49], in particular, describes compensation by using an internal node of the instrumentation amplifier, whose input has parasitic capacitances C sp and C sn , as shown in Figure 4.…”

Section: Compensating the Voltage Measured In The Chargementioning

confidence: 99%

Parasitic Effects on Electrical Bioimpedance Systems: Critical Review

Bertemes-Filho¹,

Marcôndes²,

Paterno³

2022

Preprint

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Parasitic capacitance represents the main error source in measurement systems based on electrical impedance spectroscopy. The capacitive nature of electrodes’ impedance in tetrapolar configuration can give origin to phase errors when electrodes are coupled to parasitic capacitances. Nevertheless, reactive charges in tissue excitation systems are susceptible to instability. Based on such a scenario, mitigating capacitive effects associated with the electrode is a requirement in order to reduce errors in the measurement system. A literature review about the main compensation techniques for parasitic capacitance was carried out. The selected studies were categorized into three groups: (i) compensation in electronic instrumentation; (ii) compensation in measurement processing, and (iii) compensation by negative impedance converters. The three analyzed methods emerged as effective against fixed capacitance. No method seemed capable of mitigating the effects of electrodes’ capacitance, that changes in the frequency spectrum. The analysis has revealed the need for a method to compensate varying capacitances, since electrodes’ impedance is unknown.

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“…High-frequency performances are mostly limited by its output impedance, degraded by stray capacitance. Various topologies of current source exist, such as the Howland pump and its improved version [23] or the current conveyor topology [24]. Considering the need for measurements in various contexts, several impedance analyzer devices available on the market have been used for non-implanted experiments, such as the MFIA from Zurich Instruments, the 65120B from Wayne Kerr, or the 4294A from Keysight.…”

mentioning

confidence: 99%

BIMMS: A versatile and portable system for biological tissue and electrode-tissue interface electrical characterization

Regnacq¹,

Bornat²,

Romain³

et al. 2023

HardwareX

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A wideband current source for System-on-Chip Bio-Impedance Spectroscopy using a CCII drive and Pseudo-Resistor feedback

Cited by 7 publications

References 7 publications

Wideband mirrored current source design based on differential difference amplifier for electrical bioimpedance spectroscopy

Wideband mirrored current source design based on differential difference amplifier for electrical bioimpedance spectroscopy

Parasitic Effects on Electrical Bioimpedance Systems: Critical Review

BIMMS: A versatile and portable system for biological tissue and electrode-tissue interface electrical characterization

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