1. A voltage sampling device, comprising:

a first input path, comprising:

a first input voltage-dividing resistor unit, electrically coupled between a first voltage input terminal and a first node,

the first input voltage-dividing resistor unit receiving a first input voltage from the first voltage input terminal;

a second input voltage-dividing resistor unit, electrically coupled between the first node and a ground terminal, wherein

the first input voltage-dividing resistor unit and the second input voltage-dividing resistor unit generate a first input

divided voltage at the first node according to the first input voltage; and

a first DC (direct current) voltage-dividing resistor unit, electrically coupled between the first node and a DC voltage source,

wherein the DC voltage source generates a first DC bias voltage via the first DC voltage-dividing resistor unit at the first

node, and the first DC bias voltage combines with the first input divided voltage to generate a first sampled voltage signal;

a second input path, comprising:

a third input voltage-dividing resistor unit, electrically coupled between a second voltage input terminal and a second node,

the third input voltage-dividing resistor unit receiving a second input voltage from the second voltage input terminal;

a fourth input voltage-dividing resistor unit, electrically coupled between the second node and the ground terminal, wherein

the third input voltage-dividing resistor unit and the fourth input voltage-dividing resistor unit generate a second input

divided voltage at the second node according to the second input voltage; and

a second DC voltage-dividing resistor unit, electrically coupled between the second node and the DC voltage source, wherein

the DC voltage source generates a second DC bias voltage via the second DC voltage-dividing resistor unit at the second node,

and the second DC bias voltage combines with the second input divided voltage to generate a second sampled voltage signal,

wherein resistances of the third input voltage-dividing resistor unit, the fourth input voltage-dividing resistor unit and

the second DC voltage-dividing resistor unit are substantially the same as the first input voltage-dividing resistor unit,

the second input voltage-dividing resistor unit and the first DC voltage-dividing resistor unit;

a third input path, comprising:

a fifth input voltage-dividing resistor unit, electrically coupled between a third voltage input terminal and a third node,

the fifth input voltage-dividing resistor unit receiving a third input voltage from the third voltage input terminal;

a sixth input voltage-dividing resistor unit, electrically coupled between the third node and the ground terminal, wherein

the fifth input voltage-dividing resistor unit and the sixth input voltage-dividing resistor unit generate a third input divided

voltage at the third node according to the third input voltage; and

a third DC voltage-dividing resistor unit, electrically coupled between the third node and the DC voltage source, wherein

the DC voltage source generates a third DC bias voltage via the third DC voltage-dividing resistor unit at the third node,

and the third DC bias voltage combines with the third input divided voltage to generate a third sampled voltage signal, wherein

resistances of the fifth input voltage-dividing resistor unit, the sixth input voltage-dividing resistor unit and the third

DC voltage-dividing resistor unit are substantially the same as the first input voltage-dividing resistor unit, the second

input voltage-dividing resistor unit and the first DC voltage-dividing resistor unit; and

a signal processing module, the signal processing module receiving the first sampled voltage signal, the second sampled voltage

signal and the third sampled voltage signal to perform signal processing.