a differential amplifier, comprising a first input node, a second input node, a first output node and a second output node, wherein the differential amplifier amplifies a voltage difference of the first output node and the second output node according to a first input voltage of the first input node and a second input voltage of the second input node;

a first switch, wherein a control node of the first switch is coupled to a control line, a first node of the first switch is coupled to the first input node, and a second node of the first switch is coupled to the first output node, the first switch is configured to pre-charge the first input node by a first output voltage of the first output node while the control line is received a select signal where the sense amplifier circuit is enabled by the select signal; and

a second switch, wherein a control node of the second switch is coupled to the control line, a first node of the second switch is coupled to the second input node, and a second node of the second switch is coupled to the second output node, the second switch is configured to pre-charge the second input node by a second output voltage of the second output node while the control line is received the select signal where the sense amplifier circuit is enabled by the select signal.