Comparing circuit and an image sensor including a current stabilization circuit

An image sensor comprising:

• a sensor array configured to convert light into an electrical signal to generate a pixel signal;
• a ramp signal generator configured to generate a ramp signal;
• and
• a comparing circuit configured to perform a correlated double sampling (CDS) operation in response to the pixel signal and the ramp signal,
• wherein the comparing circuit comprises:
• a first amplifier configured to perform the CDS operation;
• and
• a second amplifier configured to amplify an output signal of the first amplifier, and
• wherein the second amplifier includes a current stabilization circuit configured to supply current to the second amplifier during the CDS operation irrespective of the output signal of the first amplifier.

A comparing circuit comprising:

• a first amplifier;
• and
• a second amplifier comprising:
• a first transistor coupled between a power supply terminal and a first node, and having a gate connected to a correlated double sampling (CDS) signal source;
• a second transistor coupled between a ground terminal and the first node, and having a gate connected to a second node;
• a third transistor coupled between the first node and the second node, and having a gate connected to a switching signal source;
• and
• a current stabilization circuit comprising a fourth transistor coupled between the first node and the power supply terminal and having a gate connected to the second node.