Stochastic magnetic field micro-sensor

Hentschke, S.; Rohrer, S.; Reifschneider, N.

doi:10.1109/asic.1996.551952

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…It is important to note that in this case, the sensor is a spin torque gated stochastic magnetic field sensor. Although stochastic magnetic field sensor has been reported before, it was implemented using a stochastic flip-flop, which requires complex circuitry to ensure linearity and accuracy 47 . In contrast, the sensor presented here is extremely simple, it comprises of only a single Hall device made of FM/HM bilayer.…”

Section: Operation Principle Of Spin-torque Gate Magnetic Field Sensormentioning

confidence: 99%

Spin Torque Gate Magnetic Field Sensor

et al. 2021

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Spin-orbit torque provides an efficient pathway to manipulate the magnetic state and magnetization dynamics of magnetic materials, which is crucial for energy-efficient operation of a variety of spintronic devices such as magnetic memory, logic, oscillator, and neuromorphic computing. Here, we describe and experimentally demonstrate a strategy for the realization of a spin torque gate magnetic field sensor with extremely simple structure by exploiting the longitudinal field dependence of the spin torque driven magnetization switching. Unlike most magnetoresistance sensors which require a delicate magnetic bias to achieve a linear response to the external field, the spin torque gate sensor can achieve the same without any magnetic bias, which greatly simplifies the sensor structure. Furthermore, by driving the sensor using an ac current, the dc offset is automatically suppressed, which eliminates the need for a bridge or compensation circuit. We verify the concept using the newly developed WTe2/Ti/CoFeB trilayer and demonstrate that the sensor can work linearly in the range of ±3-10 Oe with negligible dc offset.

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Section: Operation Principle Of Spin-torque Gate Magnetic Field Sensormentioning

confidence: 99%

Spin Torque Gate Magnetic Field Sensor

et al. 2021

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“…The signal is removed for calibration by opening the transmission circuit and shorting the stochastic sensor inputs. The flip-flop sensor achieves high sensitivity by operating in the metastable region [13]. It compares the input signal to random noise to determine which way to flip.…”

Section: Descriptionmentioning

confidence: 99%

“…The response of a stochastic sensor follows a Gaussian cumulative density function (CDF) around the metastable point [13] [14][15] [16]. This can be approximated as linear when the signal is much smaller than the noise, as shown in Figure 3(b).…”

Section: Transmission Circuitmentioning

confidence: 99%

Built-in current sensor for IDDQ test

Xue

Walker

Proceedings. 2004 IEEE International Workshop on Current and Defect Based Testing (IEEE Cat. No.04EX1004)

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A practical Built-in Current Sensor (BICS) design is described in this paper. This sensor system is able to monitor the IDDQ at a resolution level of 10 µA. This system can translate the current level into a digital signal, with scan chain readout. There is no system performance degradation for this sensor and its power dissipation is kept at a very low level. With the help of a self-calibration circuit, the sensor can maintain its accuracy and achieve a clock rate of over 1 GHz, for a measurement time of a few milliseconds.

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“…The response of a stochastic sensor follows a Gaussian cumulative density function (CDF) around the metastable point [20] [21]. This can be approximated as linear when the signal is much smaller than the noise, as shown in Figure 4.…”

Section: Flip-flop Stochastic Sensormentioning

confidence: 99%

I/sub DDQ? test using built-in current sensing of supply line voltage drop

Xue

Walker

IEEE International Conference on Test, 2005.

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A practical built-in current sensor (BICS) is described that senses the voltage drop on supply lines caused by quiescent current leakage. This non-invasive procedure avoids any performance degradation. The sensor performs analog-to-digital conversion of the input signal using a stochastic process, with scan chain readout. Self-calibration and digital chopping are used to minimize offset and low frequency noise and drift. The measurement results of a 350 nm test chip are described. The sensor achieves a resolution of 182 µA, with the promise of much higher resolution.

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Stochastic magnetic field micro-sensor

Cited by 8 publications

References 6 publications

Spin Torque Gate Magnetic Field Sensor

Spin Torque Gate Magnetic Field Sensor

Built-in current sensor for IDDQ test

I/sub DDQ? test using built-in current sensing of supply line voltage drop

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