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This paper presents a study to define the optimal operation mode of the CHOPFET, a type of MagFET transducer that complies with noise and offset reduction techniques. An experimental approach including sensitivity noise and resolution measurements is proposed. The results bring out that best performance is achieved when the transducer is biased with 90% of the saturation current, independently from...
Vertical Hall-effect devices (VHDs) are CMOS integrated sensors dedicated to the measurement of magnetic field in the plane of the chip. At low frequency performances are severely reduced by the 1/f noise. We recently proposed a theoretical study which confirm the capability of the spinning current technique to lower the 1/f noise on Low-Voltage VHD. In this paper, we proposed a practical way for...
A 2D model dedicated to MAGFET-type sensors is presented. It is applied to a new device design, the CHOPFET and dedicated to accelerating the conception of CHOPFET-based instrumentation systems. FEM Simulation show significant dependence of the geometric parameters on the device's characteristics. The model allows optimization to achieve maximum sensitivity. A compact model for CAD design is also...
A novel MAGFET device is presented. Its specific architecture allows important noise reduction and thus resolution improvement by using a chopping-spinning technique performed by appropriate conditioning and read-out electronics. Experimental results have been carried out on a first non-optimized device and a sensitivity of 4 mA/T with 52 μT resolution over a bandwidth ranging from 5 Hz to 1.6 kHz...
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