Mosfet gate charge with no voltage across D-S

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SUMMARY

A MOSFET does exhibit gate charge even when there is no voltage applied across the drain-source (D-S) terminals. This is due to the intrinsic capacitance of the MOSFET, which allows it to respond to gate signals despite the absence of D-S voltage. Understanding this behavior is crucial for accurately testing MOSFET driving circuits and diagnosing faults, as the gate charge can influence the current requirements of the circuit.

PREREQUISITES
  • MOSFET operation principles
  • Understanding of gate charge and capacitance in semiconductors
  • Basic knowledge of circuit testing techniques
  • Familiarity with fault diagnosis in electronic circuits
NEXT STEPS
  • Research MOSFET gate charge characteristics and measurement techniques
  • Study the impact of intrinsic capacitance on MOSFET performance
  • Learn about MOSFET driving circuit design and testing methodologies
  • Explore fault diagnosis strategies for semiconductor devices
USEFUL FOR

Electronics engineers, circuit designers, and technicians involved in testing and troubleshooting MOSFET circuits will benefit from this discussion.

Salvador
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Hi , I would like to find out does a mosfet have any gate charge if there is no voltage applied across D-S or no ?
my intuition tells me that there shouldn't be any gate chrge as there is no voltage on the " second plate" to attract that charge like would be the case in a capacitor, although mosfte being a semiconductor maybe because its current carrying channel is doped with current carriers it responds to gate signal even with no voltage across D-S, ?

I am asking this because I need to test for a fault in my mosfet driving circuit but I need to know whether it has the same current need driving the mosfets without them being attached to voltage or no?otherwise i couldn;t fully replicate working condition and also determine the fault.
 
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You still have a small capacitance, so applying a gate voltage will lead to a gate charge.
 

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