Field-Concentrator-Based Resonant Magnetic Sensor With Integrated Planar Coils

Brugger, S.; Oliver, Paul

doi:10.1109/jmems.2009.2031675

Cited by 26 publications

(8 citation statements)

References 45 publications

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“…It could increase the electrical response of the magnetic field sensor to detect weak magnetic fields. These planar coils could be fabricated on the same silicon wafer using a physical vapor deposition (PVD) of aluminum [32] , [49] . Each coil could generate a magnetic noise using electrical current pulses with different amplitudes (about 100 mA) and random frequencies.…”

Section: Discussionmentioning

confidence: 99%

Improved Detection of Magnetic Signals by a MEMS Sensor Using Stochastic Resonance

et al. 2014

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We introduce the behavior of the electrical output response of a magnetic field sensor based on microelectromechanical systems (MEMS) technology under different levels of controlled magnetic noise. We explored whether a particular level of magnetic noise applied on the vicinity of the MEMS sensor can improve the detection of subthreshold magnetic fields. We examined the increase in the signal-to-noise ratio (SNR) of such detected magnetic fields as a function of the magnetic noise intensity. The data disclosed an inverted U-like graph between the SNR and the applied magnetic noise. This finding shows that the application of an intermediate level of noise in the environment of a MEMS magnetic field sensor improves its detection capability of subthreshold signals via the stochastic resonance phenomenon.

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Section: Discussionmentioning

confidence: 99%

Improved Detection of Magnetic Signals by a MEMS Sensor Using Stochastic Resonance

et al. 2014

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“…18 µm thick commercially available Metglas ® 2714A ribbons were successively laminated to form the magnetic core. Metglas ® 2714A was chosen as the core material for its high permeability, low energy dissipation and high resistivity [49], [50]. Metglas ® is available as a magnetically anisotropic material, makes it appropriate choice for high frequency applications.…”

Section: Magnetic Materials For Power Conversion Applicationsmentioning

confidence: 99%

3-D Microtransformers for DC–DC On-Chip Power Conversion

Moazenzadeh

Sandoval

Spengler

et al. 2015

IEEE Trans. Power Electron.

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We address the miniaturization of power converters by introducing novel, 3D microtransformers with magnetic core for low-MHz frequency applications. The core is fabricated by lamination and microstructuring of Metglas ® 2714A magnetic alloy. The solenoids of the microtransformers are wound around the core using a ball-wedge wirebonder. The wirebonding process is fast, allowing the fabrication of solenoids with up to 40 turns in 10 s. The fabricated devices yield the high inductance per unit volume of 2.95 µH/mm 3 and energy per unit volume of 133 nJ/mm 3 at the frequency of 1 MHz. The power efficiency of 64-76% are measured for different turns ratio with coupling factors as high as 98%.To demonstrate the applicability of our passive components two PWM controllers were selected to implement an isolated and a nonisolated switch mode power supply. The isolated converter operates with overall efficiency of 55% and maximum output power of 136 mW, then we experimentally demonstrate how we increased this efficiency to 71% and output power to 408 mW. The non-isolated converter can deliver an overall efficiency of 81% with a maximum output power of 515 mW. Finally, we benchmarked the results to underline the potential of the technology for power on-chip applications.Index Terms-Transformer, Magnetic layered film, DC-DC power conversion, Micromachining.

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“…6 Hz T À1 and the resolution is 217 nT however the output of the device is affected by temperature shifts. In [23] a sensor with sensitivity 1.0 MHz T À1 , resolution 400 nT, and quality factor around 2400 is demonstrated. This is another example of a magnetic field sensor which exploits the shift of the first resonant frequency of the resonator for the detection of the external magnetic field.…”

Section: Introductionmentioning

confidence: 99%