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A chopped vertical Hall sensor for detecting the speed and motion direction of magnetic encoder wheels is presented. It achieves low offset and low noise even in the case of the low intrinsic sensitivity and high voltage dependency of offset common to the vertical Hall devices. It features a combination of spinning and stacking techniques together with mixed sampled and continuous time processing,...
Low frequency noise (LFN) characteristics of high voltage double reduced-surface-field LDMOS with SiO2 as gate dielectric is investigated and the effect of DC stressing has been observed. It has been found that the LDMOS does not follow typical noise behavior of ordinary MOSFETs as extended drain attributes a significant role at higher gate overdrive voltages. Here, separation of the overall measured...
This paper demonstrates the analytical design and optimisation of piezoresistive rectangular cantilevers with particular concern for the geometric factors and associated influences of the displacement response functions through an increase in damping. Microcantilever sensors with a higher frequency response ultimately proved critical due to their response to forces that vary rapidly in time. The increase...
This paper considers mechanical stress and strain in a piezoresistive cantilever sensor under surface stress loading, which is the loading condition that occurs in biochemical sensing applications. Finite element simulations examine the piezoresistor sensitivity due to changes in cantilever length, width, and thickness, and piezoresistor size, location, and depth. A few unexpected results are found...
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