Analog-to-digital converter including comparison circuit and image sensor including same

The invention discloses an A/D converter and an image sensor. The image sensor includes: a pixel array including a plurality of pixels; a ramp signal generator configured to generate a ramp signal; and a comparison circuit configured to output a comparison result signal by comparing a pixel signal output by the pixel array with the ramp signal. The comparison circuit includes: a first comparator stage configured to output a first stage output signal to a first circuit node according to a result of comparing a pixel signal with a ramp signal; a limiter including an n-type transistor having one end connected to the first circuit node and an opposite end to which a power supply voltage is applied; and a second comparator stage configured to generate a comparison result signal by shaping the first stage output signal. 公开了A/D转换器和图像传感器。该图像传感器包括：像素阵列，包括多个像素；斜坡信号生成器，被配置为生成斜坡信号；以及比较电路，被配置为通过将像素阵列输出的像素信号与斜坡信号进行比较来输出比较结果信号。该比较电路包括：第一比较器级，被配置为根据将像素信号与斜坡信号进行比较的结果向第一电路节点输出第一级输出信号；限制器，包括n型晶体管，具有连接到第一电路节点的一端以及被施加电源电压的相对端；以及第