Dynamic comparator and circuit system using the same

A dynamic comparator, comprising a first node, a second node and a third node formed therein, and the dynamic comparator comprises:

• a differential amplifier stage configured to receive a first input signal and a second input signal and output a comparison result and an inverse comparison result of the first input signal and the second input signal to the second node and the first node, respectively, in a first comparison state and a second comparison state;
• a switching unit electrically connected to the differential amplifier stage through the first node and the second node and configured to receive a system voltage and provide a system voltage to the first node and the second node, in a first reset state and a second reset state;
• a control unit configured to control the dynamic comparator to operate in one of the first reset state, the second reset state, the first comparison state and the second comparison state;
• and
• a switching charge storage unit electrically connected to the differential amplifier stage through the third node, and electrically connected to the control unit, and comprising a charge storage capacitor, wherein when the dynamic comparator is switched from the first comparison state to the second reset state, a voltage on a second terminal of the charge storage capacitor is increased from a half of the system voltage to the system voltage, and when the dynamic comparator is switched from the second comparison state to the first reset state, a voltage on a first terminal of the charge storage capacitor is increased from a half of the system voltage to the system voltage.

A circuit system comprises a plurality of circuits, wherein the plurality of circuits comprise a dynamic comparator having a first node, a second node and a third node formed therein, the dynamic comparator is electrically connected to at least one of the plurality of circuits other than the dynamic comparator, and the dynamic comparator comprises:

• a differential amplifier stage configured to receive a first input signal and a second input signal, and output a comparison result and an inverse comparison result of the first input signal and the second input signal to the second node and the first node, respectively, in a comparison state;
• a switching unit electrically connected to the differential amplifier stage through the first node and the second node, and configured to provide a system voltage to the first node and the second node in a reset state;
• a switching charge storage unit electrically connected to the differential amplifier stage through the third node, and comprising a plurality of switching transistors, and a charge storage capacitor electrically connected to the plurality of switching transistors, wherein when the dynamic comparator is operated in the comparison state, the switching charge storage unit is configured to connect the third node to a low voltage through the charge storage capacitor, and when the dynamic comparator is operated in the reset state, the third node is not electrically connected to the switching charge storage unit, and when the dynamic comparator is switched from the comparison state to the reset state, the voltage on one of a first terminal and a second terminal of the charge storage capacitor is increased from a half of the system voltage to the system voltage.