In some situations, it becomes necessary to drive a MOSFET (or IGBT) with a voltage that’s lower than its gate-threshold voltage (VTh). This is usually done with a driver or op amp to boost the signal to a level sufficient to drive the device. However, if the power-supply voltage powering the device is below or close to VTh, then even a rail-to-rail op amp will not be able to drive the MOSFET...
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