Gate voltage bootstrap switching circuit

A gate voltage bootstrap switching circuit, adapted for a common mode voltage sampling structure, comprising a low dropout regulator (LDO), a first MOS transistor, a second MOS transistor, a third MOS transistor, and a voltage control unit;

• wherein a non-inverting input terminal of the LDO is connected to an external reference voltage, an inverting input terminal of the LDO is connected to an output terminal of the LDO which outputs a common mode voltage;
• a drain of the first MOS transistor and a source of the third MOS transistor are both connected to the output terminal of the LDO, a source of the first MOS transistor is connected to a drain of the second MOS transistor, and a source of the second MOS transistor is connected to a drain of the third MOS transistor;
• two external capacitor arrays are connected to the source and drain of the second MOS transistor, respectively;
• the voltage control unit is connected to an external power supply, and further connected to gates of the first, second, and third MOS transistors respectively to input a voltage of the external power supply as a gate-source voltage to the first, second, and third MOS transistors.