The widespread use of wired and wireless electronic systems has raised the level of electromagnetic pollution. For this reason, any electronic equipment and particularly those dealing with safety, should be conceived to work properly in harsh environments. In particular, power and analog front-end of a Smart Power integrated circuits (ICs) are directly exposed to the electromagnetic Interference (EMI) collected by cable harnesses, PCB traces, bonding wires and leadframes, which behaves like parasitic antennas. This PhD Thesis deals with the susceptibility of power and analog front-end circuits to EMI. Among the circuits for control and monitoring purpose, in this research work the current and temperature sensors are specifically addressed. An overview of the existing current sensor is provided. Two new methods for integrated current monitoring are presented in order to reduce the susceptibility to electromagnetic disturbances affecting the drain-source terminals of an integrated power MOS transistor. A new integrated solution for current monitoring based on Hall-effect is firstly proposed. This sensor exploits the magnetic sensitive properties of a split-drain transistor namely MagFET. The galvanic isolation between the sensor and the current to detect allows to increase the EMI immunity in current monitoring. Then, a further current sensor based on the mirror principle is described. Improved performance in terms of reactiveness and EMI immunity are shown. After that, the effect of EMI on integrated temperature sensors are investigated referring to a thermal shutdown circuit. The guidelines to improve to immunity to EMI of such circuits are given by means of simulations and experimental measurements that experienced the high reliability of the proposed temperature sensing in EMI polluted environment. The methods developed have been also used to design solutions to increase the immunity to EMI of readout front-end circuit for electronics employed in implanted circuit has been also presented. Bio-potential signals are usually monitored in current medical practice for diagnostics of several different disorders. Neural recording amplifiers that are usually employed to monitor such weak signals, can be can saturated by interference. Therefore, the effect of EMI received by the human body that behaves as an antenna, is a significant problem to specifically address.

Susceptibility to EMI of ICs for Power MOS Monitoring / Aiello, Orazio. - (2013).

Susceptibility to EMI of ICs for Power MOS Monitoring.

AIELLO, ORAZIO
2013

Abstract

The widespread use of wired and wireless electronic systems has raised the level of electromagnetic pollution. For this reason, any electronic equipment and particularly those dealing with safety, should be conceived to work properly in harsh environments. In particular, power and analog front-end of a Smart Power integrated circuits (ICs) are directly exposed to the electromagnetic Interference (EMI) collected by cable harnesses, PCB traces, bonding wires and leadframes, which behaves like parasitic antennas. This PhD Thesis deals with the susceptibility of power and analog front-end circuits to EMI. Among the circuits for control and monitoring purpose, in this research work the current and temperature sensors are specifically addressed. An overview of the existing current sensor is provided. Two new methods for integrated current monitoring are presented in order to reduce the susceptibility to electromagnetic disturbances affecting the drain-source terminals of an integrated power MOS transistor. A new integrated solution for current monitoring based on Hall-effect is firstly proposed. This sensor exploits the magnetic sensitive properties of a split-drain transistor namely MagFET. The galvanic isolation between the sensor and the current to detect allows to increase the EMI immunity in current monitoring. Then, a further current sensor based on the mirror principle is described. Improved performance in terms of reactiveness and EMI immunity are shown. After that, the effect of EMI on integrated temperature sensors are investigated referring to a thermal shutdown circuit. The guidelines to improve to immunity to EMI of such circuits are given by means of simulations and experimental measurements that experienced the high reliability of the proposed temperature sensing in EMI polluted environment. The methods developed have been also used to design solutions to increase the immunity to EMI of readout front-end circuit for electronics employed in implanted circuit has been also presented. Bio-potential signals are usually monitored in current medical practice for diagnostics of several different disorders. Neural recording amplifiers that are usually employed to monitor such weak signals, can be can saturated by interference. Therefore, the effect of EMI received by the human body that behaves as an antenna, is a significant problem to specifically address.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2506258
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