Package stress monitor to compensate for the piezo-hall effect in CMOS Hall sensors

Author(s):  
Samuel Huber ◽  
Christian Schott ◽  
Oliver Paul
Keyword(s):  
2021 ◽  
Vol 9 (1) ◽  
pp. 28
Author(s):  
Federico Hahn ◽  
Juan Espinoza ◽  
Ulises Zacarías

Mango is one of the main fruits grown in Mexico that are exported worldwide, but the trees consume a lot of water, and irrigation scheduling should be implemented to optimize water use. Dendrometers were installed in fruit trees to optimize water usage during 2019 and 2020. A capacitor with Teflon clamps pressurized the leaf, and its dielectric changed with leaf water content. Additionally, Hall sensors were installed in leaves to study the effect of water during mango production. It was found that capacitance tend to be more sensitive than magnetic field monitoring. Higher changes were noted during midday with warm weather. Thresholds from the capacitance and Hall effect sensors can provide signals for irrigation scheduling.


2019 ◽  
Vol 13 (2) ◽  
pp. 254-261
Author(s):  
William Alejandro López-Contreras ◽  
José Danilo Rairán-Antolines

We present the design of a magnetic encoder to measure angular position. The proposed encoder includes two Hall sensors in quadrature in a fixed platform. In addition, and over the sensors, there are two permanent magnets in a shaft. The relative motion between the fixed and the movable components generate a voltage variation in the sensors, which serve to generate the approximation of the angular position. We detail the acquisition process and the linearization method, because we consider that these are the most important contributions of this work. Lastly, we show the application of the encoder in the position control of a direct current motor to show the performance of the encoder estimating fast and slow angular position changes.


2013 ◽  
Vol 13 (8) ◽  
pp. 2890-2898 ◽  
Author(s):  
Samuel Huber ◽  
Christian Schott ◽  
Oliver Paul
Keyword(s):  

RSC Advances ◽  
2021 ◽  
Vol 11 (13) ◽  
pp. 7257-7270
Author(s):  
Hua Fan ◽  
Jiangming Wang ◽  
Quanyuan Feng ◽  
Qiang Hu ◽  
Siming Zuo ◽  
...  

Integrated magnetic Hall effect sensors have been widely used in people's lives over the past decades. They are still gaining enormous attention from researchers to establish novel applications, especially in biochemistry and biomedical healthcare.


ACTA IMEKO ◽  
2017 ◽  
Vol 6 (4) ◽  
pp. 17 ◽  
Author(s):  
Marco Crescentini ◽  
Marco Marchesi ◽  
Aldo Romani ◽  
Marco Tartagni ◽  
Pier Andrea Traverso

<p class="Abstract"><span lang="EN-GB">Modern power applications are demanding for small and broadband current sensors. Hall sensors are a good solution, but practical implementations are limited to a few hundred kHz. The literature offers a theoretical knowledge about the dynamic effects acting on the Hall probe but does neither define nor experimentally assess the bandwidth fundamental upper limit, since many parasitic dynamic effects perturb the inherent time response of the Hall sensor. This paper experimentally investigates the bandwidth upper limits in CMOS Hall effect-based current sensors. Based on the physics-based description of the Hall probe, the paper defines a novel, special-purpose, measurement technique, which is able to experimentally evaluate the inherent response time of the Hall probe without triggering the main parasitic effects. The paper also propose an equivalent electrical model describing the dynamic response of the Hall probe so as to better explain and understood the measurement results. Specifically, the paper identifies two bandwidth upper limits: a fundamental limit set by the intrinsic capacitance, which models the transversal charge accumulation due to the Hall effect, and a more practical limit set by the capacitive input of the electronic readout interface. Some main parasitic effects are then assess and added in the proposed model.</span></p>


2022 ◽  
Vol 2022 ◽  
pp. 1-13
Author(s):  
Majid Nour ◽  
Nihat Daldal ◽  
Mehmet Fatih Kahraman ◽  
Hatem Sindi ◽  
Adi Alhudhaif ◽  
...  

A tilt sensor is a device used to measure the tilt on many axes of a reference point. Tilt sensors measure the bending position according to gravity and are used in many applications. Slope sensors allow easy detection of direction or slope in the air. These tilt gauges have become increasingly popular and are being adapted for a growing number of high-end applications. As an example of practical application, the tilt sensor provides valuable information about an aircraft’s vertical and horizontal tilt. This information also helps the pilot understand how to deal with obstacles during flight. In this paper, Hall-effect effective inclination and acceleration sensor design, which makes a real-time measurement, have been realized. 6 Hall-effect sensors with analog output (UGN-3503) have been used in the sensor structure. These sensors are placed in a machine, and the hall sensor outputs are continuously read according to the movement speed and direction of the sphere magnet placed in the assembly. Hall sensor outputs produce 0–5 Volt analog voltage according to the position of the magnet sphere to the sensor. It is clear that the sphere magnet moves according to the inclination of the mechanism when the mechanism is moved angularly, and the speed of movement from one point to the other changes according to the movement speed. Here, the sphere magnet moves between the hall sensors in the setup according to the ambient inclination and motion acceleration. Each sensor produces analog output values in the range of 0–5 V instantaneous according to the position of the spheroid. Generally defined, according to the sphere magnet position and movement speed, the data received from the hall sensors by the microcontroller have been sent to the computer or microcomputer unit as UART. In the next stage, the actual sensor has been removed. The angle and acceleration values have been continuously produced according to the mechanism’s movement and output as UART. Thanks to the fact that the magnet is not left idle and is fixed with springs, problems such as vibration noises and wrong movements and the magnet leaning to the very edge and being out of position even at a slight inclination are prevented. In addition, the Hall-effect sensor outputs are given to an artificial neural network (ANN), and the slope and acceleration information is estimated in the ANN by training with the data obtained from the real-time slope and accelerometer sensor.


Author(s):  
Steven Chen ◽  
J. Albert Chiou

A piezoresistive transducer (PRT) pressure sensor would be able to sense a magnetic field and provide an adequate Hall effect output. In this study, two different types of boron-doped transducers, X-ducer and picture-frame transducer (also called micro Wheatstone-bridge transducer) were tested for the Hall effect. It is found that the currently used fabrication process and packaging for PRT pressure sensors do not need to be altered for Hall sensors. However, a slight mask modification is necessary to use an X-ducer instead of a picture-frame transducer for the Hall effect sensing because the X-ducer is at least 50 times more sensitive than the picture-frame transducer. The sensitivity calculated using the Hall theory and estimated hole mobility velocity is in reasonably good agreement with experimental results.


2007 ◽  
Vol 7 (11) ◽  
pp. 1475-1482 ◽  
Author(s):  
Udo Ausserlechner ◽  
Mario Motz ◽  
Michael Holliber
Keyword(s):  

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