Power switch and operation method thereof

A power switch comprising:

• a first power supply of a first voltage level;
• a first switching circuit coupled to a first output terminal and configured to selectively couple the first output terminal to a first ground terminal;
• a second switching circuit coupled to a second output terminal and configured to selectively couple the second output terminal to a second ground terminal;
• and
• a cross-coupled amplifier having a power node coupled to the first power supply, a first input/output node coupled to the first switching circuit, and a second input/output node coupled to the second switching circuit, the cross-coupled amplifier comprising:
• a first PMOS transistor having a source terminal, a drain terminal, and a gate terminal, the source terminal of the first PMOS transistor connected to the power node;
• a second PMOS transistor having a source terminal, a drain terminal, and a gate terminal, the source terminal of the second PMOS transistor connected to the power node;
• a third PMOS transistor having a source terminal, a drain terminal, and a gate terminal, the source terminal of the third PMOS transistor connected to the drain terminal of the first PMOS transistor, and the drain terminal of the third PMOS transistor connected to the first input/output node;
• and
• a fourth PMOS transistor having a source terminal, a drain terminal, and a gate terminal, the source terminal of the fourth PMOS transistor connected to the drain terminal of the second PMOS transistor, and the drain terminal of the fourth PMOS transistor connected to the second input/output node,
• the gate terminals of the first and third PMOS transistors being connected to the second input/output node, and the gate terminals of the second and fourth PMOS transistors being connected to the first input/output node.