Image sensor including noise compensator and image sensing system including the same

An image sensor comprising:

• a pixel configured to generate a pixel signal, using an analog signal processing voltage;
• a ramp signal generator configured to generate a ramp signal, using the analog signal processing voltage;
• a bias voltage generator configured to generate a bias voltage, using the analog signal processing voltage;
• a conversion circuit configured to:
• generate a reference voltage, based on the generated bias voltage and the generated ramp signal;
• and
• generate a first digital signal by performing analog-to-digital conversion on the generated pixel signal, based on the generated reference voltage;
• a noise compensator configured to:
• generate a noise signal, using a digital signal processing voltage and the analog signal processing voltage;
• and
• generate a second digital signal by performing analog-to-digital conversion on the generated noise signal, based on the generated ramp signal;
• and
• a subtracter configured to generate a third digital signal by subtracting the generated second digital signal from the generated first digital signal.

An image sensing system comprising:

• an image sensor configured to output an image signal by sensing light incident on a pixel;
• and
• an image signal processor configured to process the outputted image signal, using a first digital signal processing voltage,
• wherein the image sensor comprises:
• the pixel configured to generate a pixel signal, using an analog signal processing voltage;
• a ramp signal generator configured to generate a ramp signal, using the analog signal processing voltage;
• a bias voltage generator configured to generate a bias voltage, using the analog signal processing voltage;
• a noise compensator configured to:
• generate a noise component, using the first digital signal processing voltage, a second digital signal processing voltage and the analog signal processing voltage;
• and
• add the generated noise component to the generated bias voltage;
• and
• a conversion circuit configured to:
• generate a reference voltage, based on the generated ramp signal and the bias voltage to which the noise component is added;
• and
• generate the image signal by performing analog-to-digital conversion on the generated pixel signal, based on the generated reference voltage.