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The increasing replacement of mechanical parts by x-by-wire systems in automotive applications allows improving driver safety. These systems demand highly dependable sensors that ensure their functionality despite the harsh operating conditions. This means that the sensors should be capable of working continuously despite catastrophic faults and keeping the performance over time. An anisotropic magnetoresistance...
Electronic systems are replacing mechanical parts to improve the safety and performance of the cars. However, the electronic components should be dependable, meaning they should be trusted to work properly over time. AMR sensors are widely used in automotive for angle measurements. Nevertheless, they are affected by performance degradation and catastrophic faults. Both should be handled to guarantee...
Anisotropic Magnetoresistance (AMR) sensors are magnetic sensors often used for angle measurements. The sensor outputs should be two perfect sinusoidal signals that depend on the angle to be measured. However due to non-ideal properties of the sensor, the actual outputs include undesired parameters as offset voltage, amplitude imbalance and harmonics. All of them generate errors in the angle calculation...
Anisotropic Magnetoresistance (AMR) sensors are often used for angle measurements. The sensor outputs consist of two sinusoidal signals that show undesired characteristics as offset voltage, amplitude imbalance and harmonics, which affect the angle measurements. These parameters change due to aging effects, but until now it is considered that these variations do not affect the sensor accuracy. The...
An Anisotropic Magnetoresistance (AMR) sensor is magnetic sensor often used to angle measurements. In case the sensor is configured with two Wheatstone bridges, it provides two sinusoidal outputs useful to calculate the angle of a magnetic field. However, due to non-ideal properties of the sensor, its output signals present undesired characteristics such as offset voltage, amplitude imbalance and...
Anisotropic Magnetoresistance angle sensors are widely used in automotive applications considered to be safety-critical applications. Therefore dependability is an important requirement and fault-tolerant strategies must be used to guarantee the correct operation of the sensors even in case of failures. AMR sensors are configured with two Wheatstones bridges where catastrophic (hard) as well as parametric...
Usually Anisotropic Magnetoresistance angle sensors are configured with two Wheatstone bridges, but an undesirable offset voltage included in the sensor output affects its accuracy. The total offset voltage combines a voltage due to resistance mismatches during manufacturing and a voltage from inequalities in the magnetic sensitivity. This paper focuses on identifying a consistent trend between the...
The offset voltage is an undesirable voltage included at the output of an anisotropic magnetoresistance angle sensor, which affects the accuracy of the angle measurement. This voltage changes with sensor aging and hence should be compensated not just at the moment of manufacturing but also during the sensor lifetime. This can be accomplished by an online offset voltage compensation method. However,...
The use of textile yarns as data transmission media enables the design of non-obtrusive well-fitting garments as wearable systems. However, textile conductive yarns show impedances higher than those presented by common metal conductors and these values can change with the textile condition and level of stretching, affecting the integrity of the transmitted signal. This work proposes a built-in self-test...
A design methodology for a pilot communications infrastructure to enable Telemedicine services in ambulatory primary health care centers located within “Baruta” and “El Hatillo” municipalities in Venezuela's Miranda state. The main purpose of the proposed infrastructure is to provide voice and data network connectivity between these primary care centers and a chief facility, a local major hospital...
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