Abstract
In this study, a programmable Magneto-Impedance (MI) sensor circuit has been designed by using a Field-Programmable-Gate-Arrays (FPGA), and an operational amplifier integrator has been used to replace the peak hold circuit in the conventional system to sample the entire output of the sensor. Since there is no need to adjust the sampling timing to match different MI sensor’s outputs, it is more suitable for mass production than conventional circuits. It was also found that the output of the sensor has the same sensitivity on the rising and falling edges of the excitation current. The output of two parts of the sensor is sampled by an asynchronous sampling frequency, and the noise level of the system proposed is reduced. In comparison with the conventional system, the proposed system in this work has higher sensitivity and lower noise level when utilizing the same sensor, so it might be applied to the bio-medical signal measurement in the future.
Highlights
Sensors play an important role in our life and the Internet of Things (IoT), such as smart devices, vehicles, and other devices, all of which use sensors
A practical MI sensor electronic circuit was invented in 1997.3 A hightemperature stable MI sensor electronic circuit was invented in 1999.4 The electronic compass based on the MI sensor was massproduced by Aichi Steel in 2003 and applied to smart devices
A programmable sensor circuit using a FieldProgrammable-Gate-Arrays (FPGA) has been developed, the peak hold circuit was replaced by an operational amplifier Integrator (Op-amp Integrator) to improve the compatibility of the sensor circuit
Summary
Sensors play an important role in our life and the Internet of Things (IoT), such as smart devices, vehicles, and other devices, all of which use sensors. A practical MI sensor electronic circuit was invented in 1997.3 A hightemperature stable MI sensor electronic circuit was invented in 1999.4 The electronic compass based on the MI sensor was massproduced by Aichi Steel in 2003 and applied to smart devices.. MI sensors with pico-Tesla (10-8Oe) resolution have been developed.. The conventional MI sensor circuits based on peak hold circuits have inferior flexibility in mass production. A programmable sensor circuit using a FieldProgrammable-Gate-Arrays (FPGA) has been developed, the peak hold circuit was replaced by an operational amplifier Integrator (Op-amp Integrator) to improve the compatibility of the sensor circuit
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