A 10-mW two-channel fully integrated system-on-chip for eddy-current position sensing [in biomedical devices]

Oberle, Michael; Reutemann, R.; Hertle, R.; Huang, Qiuting

doi:10.1109/jssc.2002.1015691

Cited by 25 publications

(5 citation statements)

References 6 publications

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“…A more power-efficient alternative to interface an ECS is to use the sensing coil as part of a resonator and/or oscillator [13]- [16]. State-of-the-art ECS interfaces are in this design direction and are evaluated in the subsections below.…”

Section: Interfaces With Sensor As a Part Of Thementioning

confidence: 99%

“…In [13] a switched-capacitor (SC) oscillator is employed to generate a pseudo sine wave to excite the sensing coils (Fig. 7).…”

Section: A Utilizing External Switched-capacitor Oscillator and Lc Rmentioning

confidence: 99%

“…Furthermore, BJTs offer a considerably lower 1/ f noise than their MOS counterparts (about two orders of magnitude in the technology employed, with a similar biasing current and die area). The combination of a [13] Relaxation oscillator [18] LC oscillator [14] LC oscillator with ratiometric and precision peak detection [22] LC oscillator with ratiometric and synchronous detection [28] Excitation lower 1/ f noise and a larger transconductance (under similar conditions) makes the BiCMOS process a proper choice for ECS interfacing, which requires a high excitation frequency, high measurement stability, and low-power functionality.…”

Section: Synchronous Detection-based Ecs Interfacementioning

confidence: 99%

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Design Strategies for Eddy-Current Displacement Sensor Systems: Review and Recommendations

Nabavi¹,

Nihtianov

2012

IEEE Sensors J.

127

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This paper presents a comprehensive study of the design aspects of eddy-current displacement sensor (ECS) systems. In accordance with the sensor analysis presented in this paper, design strategies to compensate for important sensor imperfections are recommended. To this end, the challenges that are associated with ECS interfaces are identified, with focus on advanced industrial applications. This paper also provides a technical overview of the design advances of ECS interfaces proposed in the last decade and evaluates their pros and cons. Recently reported interface solutions for demanding industrial applications with respect to high resolution, stability, bandwidth, and low power consumption, at a sufficiently high excitation frequency, are addressed in more detail.

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Section: Interfaces With Sensor As a Part Of Thementioning

confidence: 99%

“…In [13] a switched-capacitor (SC) oscillator is employed to generate a pseudo sine wave to excite the sensing coils (Fig. 7).…”

Section: A Utilizing External Switched-capacitor Oscillator and Lc Rmentioning

confidence: 99%

Section: Synchronous Detection-based Ecs Interfacementioning

confidence: 99%

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Design Strategies for Eddy-Current Displacement Sensor Systems: Review and Recommendations

Nabavi¹,

Nihtianov

2012

IEEE Sensors J.

127

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“…The resolution of the ECDS can reach micron level or even below [ 16 , 17 , 18 ]. However, the relatively low sensitivity and linearity seriously restrict the detection accuracy because it is usually calibrated by a linear model before industrial use, neglecting the nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor

Liu

Jia

et al. 2018

Sensors

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High precision position control is essential in the process of parts manufacturing and assembling, where eddy current displacement sensors (ECDSs) are widely used owing to the advantages of non-contact sensing, compact volume, and resistance to harsh conditions. To solve the nonlinear characteristics of the sensors, a high-accuracy calibration method based on linearity adjustment is proposed for ECDSs in this paper, which markedly improves the calibration accuracy and then the measurement accuracy. After matching the displacement value and the output voltage of the sensors, firstly, the sensitivity is adjusted according to the specified output range. Then, the weighted support vector adjustment models with the optimal weight of the zero-scale, mid-scale and full-scale are established respectively to cyclically adjust the linearity of the output characteristic curve. Finally, the final linearity adjustment model is obtained, and both the calibration accuracy and precision are verified by the established calibration system. Experimental results show that the linearity of the output characteristic curve of ECDS adjusted by the calibration method reaches over 99.9%, increasing by 1.9–5.0% more than the one of the original. In addition, the measurement accuracy improves from 11–25 μm to 1–10 μm in the range of 6mm, which provides a reliable guarantee for high accuracy displacement measurement.

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“…With the proliferation of battery-operated portable systems and emerging self-powered devices, integrated power electronics attracts ever-increasing attentions in low-power system designs [1,2]. This is because clean and stable onchip power delivery is paramount to circuit performance and battery run-time.…”

Section: Introductionmentioning

confidence: 99%

Integrated interleaving SC power converters with analog and digital control schemes for energy-efficient microsystems

Somasundaram

2009

Analog Integr Circ Sig Process

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This paper addresses design strategies and tradeoffs of a series of newly developed interleaving switched-capacitor power converters. In such a design, a converter consists of multiple sub-cells in the power stage, and is regulated with interleaving power flow control. By splitting the power flow in a time-sequenced manner, the converter maintains a continuous power delivery flow to the output V OUT , with significant reductions on the in-rush input current and the output voltage ripples. System modeling and optimization focusing on power efficiency and z-domain closed-loop gain enhancement are discussed. An experimental prototype was successfully fabricated with a standard 0.35-lm digital CMOS N-well process. The entire die area, including fully integrated pads and power devices, is 3.84 mm 2 . Measurement results show that, with a supply voltage of 1.5 V and a load of 250 mA, the output of the converter is well regulated at 2.5 V with 16-mV ripple. The maximum efficiency of 82.3% is achieved at the output power of 625 mW.

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A 10-mW two-channel fully integrated system-on-chip for eddy-current position sensing [in biomedical devices]

Cited by 25 publications

References 6 publications

Design Strategies for Eddy-Current Displacement Sensor Systems: Review and Recommendations

Design Strategies for Eddy-Current Displacement Sensor Systems: Review and Recommendations

High-Accuracy Calibration Based on Linearity Adjustment for Eddy Current Displacement Sensor

Integrated interleaving SC power converters with analog and digital control schemes for energy-efficient microsystems

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