his article discusses:

1. What is the GS waveform of a MOSFET?

2. The role and impact of the GS waveform

3. Analysis of the GS waveform in the working state of the MOSFET

What is the GS waveform of a MOSFET?

The GS waveform refers to the voltage waveform between the gate and the source of a MOSFET, which varies with time. It controls the switching state of the MOSFET in the circuit by the voltage between the gate and the source. The GS waveform has a great influence on the characteristics of the MOSFET in different working states and the performance of the design circuit.

The role and impact of the GS waveform

Role of the GS waveform: It controls the conduction and cutoff of the MOSFET during its operation.

If the amplitude of the GS waveform is greater than the threshold voltage of the MOSFET, the MOSFET will conduct; If the amplitude of the GS waveform is less than the threshold voltage of the MOSFET, the MOSFET will cutoff.

Impact of the GS waveform: If the rise and fall time of the GS waveform is too long, it will slow down the switching speed of the MOSFET, affecting its efficiency. If the amplitude of the GS waveform is too large or too small, it can also cause abnormal operation or damage to the MOSFET.

Analysis of the GS waveform in the working state of the MOSFET

There are three states of the GS waveform in the working state of the MOSFET: switching, conduction, and cutoff.

Switching state: When the gate voltage is higher than the source voltage, the MOSFET is in the conduction state, and the current flows through, resulting in a high-level GS waveform.

Conduction state: The MOSFET is conducting, and the current flows through, resulting in a stable DC voltage waveform. The voltage magnitude here depends on the difference between the gate voltage and the source voltage.

Cutoff state: When the gate voltage is lower than the source voltage, the MOSFET is cutoff, and no current flows through. The GS waveform is at a low level.