Pulse generator and image sensor including the same

A pulse generator, comprising:

• a clock synchronization circuit configured to receive an input signal and a first clock signal, and to output a pull-up signal and a pull-down signal synchronized with the first clock signal based on the input signal;
• a pull-up latch circuit configured to generate a first output signal based on the pull-up signal;
• a pull-down latch circuit configured to generate a second output signal based on the pull-down signal;
• and
• an output circuit configured to generate a pulse signal based on the first output signal and the second output signal.

An image sensor, comprising:

• a pixel array including at least one pixel;
• a correlated double sampling circuit configured to compare a magnitude of a pixel signal output from the at least one pixel with a magnitude of a ramp signal, and to output a comparison signal;
• a timing controller configured to generate a reference clock signal;
• a counting code generator configured to generate a first clock signal by dividing the reference clock signal, and to generate a counting code;
• a pulse generator configured to be delayed for a certain time from a timing at which a level of the comparison signal transitions, and to generate a pulse signal including a pulse having a pulse width corresponding to the first clock signal;
• and
• a counter circuit configured to latch a code value of the counting code based on the pulse signal.