27.9 A 200kS/s 13.5b integrated-fluxgate differential-magnetic-to-digital converter with an oversampling compensation loop for contactless current sensing

Kashmiri, Mahdi; Kindt, W.J.; Witte, Frerik; Kearey, R.F.; Carbonell, Daniel

doi:10.1109/isscc.2015.7063140

Cited by 23 publications

(9 citation statements)

References 9 publications

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“…Although [6] achieves a much better offset, its bandwidth is severely limited by the use of 8-phase spinning and low-pass filtering. The recently introduced fluxgate-based sensor [4] has even better offset. However, despite its higher power consumption, its bandwidth is limited to 75 kHz.…”

Section: B Measurement Results Of the Hybrid Multi-path Systemmentioning

confidence: 99%

Multipath Wide-Bandwidth CMOS Magnetic Sensors

Jiang

Makinwa

2017

IEEE J. Solid-State Circuits

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This paper proposes a multi-path multi-sensor architecture for CMOS magnetic sensors, which effectively extends their bandwidth without compromising either their offset or resolution. Two designs utilizing the proposed architecture were fabricated in a 0.18 μm standard CMOS process. In the first, the combination of spinning-current Hall sensors and non-spun Hall sensors achieves an offset of 40 μT, and a resolution of 272 μTrms in a bandwidth of 400 kHz, which is 40x more than previous low-offset CMOS Hall sensors. In the second, the combination of spinning-current Hall sensors and pick-up coils achieves the same offset, with a resolution of 210 μTrms in a further extended bandwidth of 3 MHz, which is the widest bandwidth ever reported for a CMOS magnetic sensor.

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Section: B Measurement Results Of the Hybrid Multi-path Systemmentioning

confidence: 99%

Multipath Wide-Bandwidth CMOS Magnetic Sensors

Jiang

Makinwa

2017

IEEE J. Solid-State Circuits

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“…Exciting the sensor by short pulses allows to use high excitation current peaks, which were shown to reduce perming effect and reduce the sensor noise similarly as excitation tuning which is routinely used for sensors wire-wound excitation winding [10]. Pulse excitation and processing by gated integrators is prospective for the design of integrated fluxgate sensors [11][12][13][14]. > FOR CONFERENCE-RELATED PAPERS, REPLACE THIS LINE WITH YOUR SESSION NUMBER, E.G., AB-02 (DOUBLE-CLICK HERE) < 2 the sensor tracks.…”

Section: Pulse Excited Racetrack Fluxgatementioning

confidence: 99%

Flugate Sensor With Pulse Feedback

et al. 2016

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Fluxgate sensors have typically only 100 µT range, which sometimes limits their applications. Main obstacle for increasing the measurement range power dissipated in their feedback coil. Until now the feedback was always continuous. We suggest to use pulse excitation only for the active part of the period, in which output signal is present. In this paper we show for the first time that if the sensor is excited by short pulses, the feedback need not be continuous, but it can be formed by pulses slightly wider than the excitation pulses. We have shown that in our case the feedback current duty cycle can be only 17.25 %. This means that for the same power we can increase maximum feedback current and thus the range by the factor of three. We show that this can be done without compromising the sensor performance.

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“…A CCURATE current sensing is critical in many applications including battery management, motor control, and over-current protection. Several types of current sensors exist: inductive sensors (e.g., Rogowski coils), magnetic field sensors (based on the Hall effect or fluxgates) [1]- [3] and shunt-resistor-based sensors [4], [5]. Inductive and magnetic sensors enable non-contact current measurements and are well suited to high-voltage (HV) applications (>100 V).…”

Section: Introductionmentioning

confidence: 99%

A ±4-A High-Side Current Sensor With 0.9% Gain Error From −40 °C to 85 °C Using an Analog Temperature Compensation Technique

Huijsing

Makinwa

2018

IEEE J. Solid-State Circuits

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This paper presents a fully integrated shunt-based current sensor that supports a 25-V input common-mode range while operating from a single 1.5-V supply. It uses a highvoltage beyond-the-rails ADC to directly digitize the voltage across an on-chip shunt resistor. To compensate for the shunt's large temperature coefficient of resistance (∼0.335%/°C), the ADC employs a proportional-to-absolute-temperature voltage reference. This analog compensation scheme obviates the need for the explicit temperature sensor and calibration logic required by digital compensation schemes. The sensor achieves 1.5-μV rms noise over a 2-ms conversion time while drawing only 10.9 μA from a 1.5-V supply. Over a ±4-A range, and after a one-point trim, the sensor exhibits a 0.9% (maximum) gain error from −40°C to 85°C and a 0.05% gain error at room temperature.

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27.9 A 200kS/s 13.5b integrated-fluxgate differential-magnetic-to-digital converter with an oversampling compensation loop for contactless current sensing

Cited by 23 publications

References 9 publications

Multipath Wide-Bandwidth CMOS Magnetic Sensors

Multipath Wide-Bandwidth CMOS Magnetic Sensors

Flugate Sensor With Pulse Feedback

A ±4-A High-Side Current Sensor With 0.9% Gain Error From −40 °C to 85 °C Using an Analog Temperature Compensation Technique

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