Low Power CMOS-Based Hall Sensor with Simple Structure Using Double-Sampling Delta-Sigma ADC

Lee, Ju Yong; Oh, Younggyun; Oh, Saewoong; Chae, Hyungil

doi:10.3390/s20185285

Cited by 19 publications

(8 citation statements)

References 28 publications

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“…Meanwhile, the offset in the Hall voltage arises from misalignment of contacts and/or inhomogeneous current flow in the active sensor area. This is a common issue found in Hall-effect sensors, which can be minimized by various circuit techniques, such as auto-zeroing 42 , chopper stabilization 43 , and correlated double sampling 44 .…”

Section: Magneto-electro-mechanical Responsementioning

confidence: 99%

Flexible Hall sensor made of laser-scribed graphene

et al. 2021

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Graphene has shown considerable potential for sensing magnetic fields based on the Hall Effect, due to its high carrier mobility, low sheet carrier density, and low-temperature dependence. However, the cost of graphene in comparison to conventional materials has meant that its uptake in electronic manufacturing has been slow. To lower technological barriers and bring more widespread adoption of graphene Hall sensors, we are using a one-step laser scribing process that does not rely on multiple steps, toxic chemicals, and subsequent treatments. Laser-scribed graphene Hall sensors offer a linear response to magnetic fields with a normalized sensitivity of ~1.12 V/AT. They also exhibit a low constant noise voltage floor of ~ 50 nV/$$\sqrt {{\mathrm{Hz}}}$$ Hz for a bias current of 100 µA at room temperature, which is comparable with state-of-the-art low-noise Hall sensors. The sensors combine a high bendability, come with high robustness and operating temperatures up to 400 °C. They enable device ideas in various areas, for instance, soft robotics. As an example, we combined a laser-scribed graphene sensor with a deformable elastomer and flexible magnet to realize low-cost, compliant, and customizable tactile sensors.

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Section: Magneto-electro-mechanical Responsementioning

confidence: 99%

Flexible Hall sensor made of laser-scribed graphene

et al. 2021

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“…The hall-effect current sensors are designed as a separate chips or components, which interrupt current lines or use hole-through technologies. They have internal amplification and compensation circuits and output more stable and precise signal [57], which makes implementation of additional protection algorithms possible [58,59], however these sensors need additional space and significantly increase cost of the power converter, which restricts their usage in low-cost drives. Simultaneously, shunt-based current sensors are small, cheap and suitable for low-cost solutions, but their amplification circuits are placed distantly, which increase noise to signal ratio.…”

Section: Classificationmentioning

confidence: 99%

Phase Loss Detection Using Current Signals: A Review

Dianov

Anuchin

2021

IEEE Access

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This paper discusses open phase faults, which can happen in a system grid-converter-motor drive, and measures to properly handle this type of fault. The authors of this paper provide classification of algorithms used for the detection of the loss of phase and explain the distinctive features of each group of methods. They review existing algorithms, which are based on the analysis of the current signals, discuss their pros and cons and suggest possible areas of usage for each group of methods. The authors also propose one novel method for detection of open phase, which was developed for low-cost systems with low resolution analog-to digital converters (ADC). This paper mainly considers methods for three-phase motors as the most popular machines, however some algorithms can be used in multiphase drives. The authors of the paper also share their more than 20 years' experience combined, in this area, which was obtained by developing industrial and commercial drives, and focus on the requirements of the IEC/UL 60730 safety standard, where the phase-loss detection algorithm is one of the essential parts of control system.

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“…The ADC is a third-order delta-sigma modulator introduced in [ 27 ] and consists of an integrator, a multi-input comparator [ 28 , 29 ], a 1 bit quantizer with lower design complexity than the multibit quantizer, and a digital controller. As mentioned in Section 2 , the required ADC minimum ENOB is 11 bits, and the target ADC resolution for this is 13 bits.…”

Section: Circuit Implementationmentioning

confidence: 99%

“…Although the structure presented here is similar to that in [ 27 ], the ADC in this study was designed to further minimize power consumption because it has a low BW of 100 kHz. Since the first integrator dominates the overall ADC performance, the power consumption ratios of the three integrators are scaled as 1:0.6:0.5 to significantly lower the overall power consumption.…”

Section: Circuit Implementationmentioning

confidence: 99%

Readout Integrated Circuit for Small-Sized and Low-Power Gas Sensor Based on HEMT Device

Lee

Jin

Baek

et al. 2021

Sensors

Self Cite

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This paper presents a small-sized, low-power gas sensor system combining a high-electron-mobility transistor (HEMT) device and readout integrated circuit (ROIC). Using a semiconductor-based HEMT as a gas-sensing device, it is possible to secure high sensitivity, reduced complexity, low power, and small size of the ROIC sensor system. Unlike existing gas sensors comprising only HEMT elements, the proposed sensor system has both an ROIC and a digital controller and can control sensor operation through a simple calibration process with digital signal processing while maintaining constant performance despite variations. The ROIC mainly consists of a transimpedance amplifier (TIA), a negative-voltage generator, and an analog-to-digital converter (ADC) and is designed to match a minimum target detection unit of 1 ppm for hydrogen. The prototype ROIC for the HEMT presented herein was implemented in a 0.18 µm complementary metal–oxide–semiconductor (CMOS) process. The total measured power consumption and detection unit of the proposed ROIC for hydrogen gas were 3.1 mW and 2.6 ppm, respectively.

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Low Power CMOS-Based Hall Sensor with Simple Structure Using Double-Sampling Delta-Sigma ADC

Cited by 19 publications

References 28 publications

Flexible Hall sensor made of laser-scribed graphene

Flexible Hall sensor made of laser-scribed graphene

Phase Loss Detection Using Current Signals: A Review

Readout Integrated Circuit for Small-Sized and Low-Power Gas Sensor Based on HEMT Device

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