Comparison circuit and image sensing device including the same

A comparison circuit comprising:

• a comparator configured to compare signals of input nodes with each other and configured to output a signal corresponding to a result of the comparison to an output node;
• a first switching element connected to an input node of the input nodes;
• a first capacitor connected between the first switching element and the comparator;
• a second switching element connected between one terminal of the first capacitor and a ground voltage terminal;
• a third switching element connected between an input terminal and an output terminal of the comparator;
• a fourth switching element having one terminal connected to the output node;
• a resistor connected to another terminal of the fourth switching element;
• a second capacitor connected between the resistor and the ground voltage terminal;
• and
• a fifth switching element connected between the ground voltage terminal and a connection node disposed between the fourth switching element and the resistor.

An image sensing device comprising:

• a voltage generator configured to generate an operation voltage by pumping an input voltage;
• a row driver configured to generate a drive voltage based on the operation voltage;
• and
• a pixel array configured to generate a pixel signal by controlling a pixel circuit in response to the drive voltage,
• wherein the voltage generator includes a comparison circuit that compares signals of input nodes with each other and outputs a signal corresponding to a result of the comparison to an output node,
• wherein the comparison circuit includes a stabilization circuit configured to supply a first voltage to the output node by connecting to the output node within an auto zero period and configured to block a connection to the output node within a comparison operation period,
• wherein the stabilization circuit includes:
• a first switching element having one terminal connected to the output node;
• a resistor connected to another terminal of the first switching element;
• a capacitor connected between the resistor and a ground voltage terminal;
• and
• a second switching element connected between the ground voltage terminal and a connection node disposed between the first switching element and the resistor.