Gate drive circuit

A gate drive circuit comprising:

• a modulated signal generation circuit that modulates a radio-frequency wave, to generate a first modulated signal including a first amplitude, a second amplitude larger than the first amplitude, and a third amplitude larger than the second amplitude;
• a first isolator that isolatedly transmits the first modulated signal;
• a first rectifier circuit that rectifies the first modulated signal which has been transmitted by the first isolator, to generate a first output signal including a first output voltage value according to the first amplitude, a second output voltage value according to the second amplitude, and a third output voltage value according to the third amplitude;
• and
• an output terminal through which a driving signal is output to a semiconductor switch, the driving signal including at least part of the first output signal.