Data-acquisition system uses fault protection


Posted on Mar 29, 2013

Sensitive systems, such as those in aircraft, must withstand fault conditions, thereby avoiding component and system damage, because a sensor failure could cause a catastrophic event to occur. A channel protector, comprising two n-channel MOSFETs connected in series with a p-channel MOSFET, can protect sensitive components from voltage transients in the signal path, whether or not the power supplies are present (Figure 1).



The channel protector acts as series resistor during normal operation. If the input exceeds the power-supply voltages, one of the MOSFETs turns off, clamping the output within the supply rails, thus protecting the circuitry in the event of overvoltage or




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