| CPC H04N 25/772 (2023.01) [H03K 5/2481 (2013.01); H03M 1/34 (2013.01); H04N 25/75 (2023.01)] | 13 Claims |
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1. A light detecting device comprising:
a pixel configured to generate a pixel signal; and
a comparator comprising:
a first capacitor configured to receive the pixel signal;
a second capacitor configured to receive a reference signal;
a first node coupled to the first capacitor and the second capacitor; and
a single type amplifier including:
a first transistor having a gate coupled to the first node;
a second transistor disposed between a first line supplied with a first voltage and the first transistor; and
a third transistor disposed between the first transistor and the second transistor,
wherein the first transistor is coupled between the second transistor and a second line supplied with a second voltage different from the first voltage,
wherein a polarity of the first transistor is opposite to a polarity of the second transistor,
wherein a gate of the second transistor is configured to receive a first bias voltage,
wherein a gate of the third transistor is coupled to the first line and the gate of the second transistor is coupled to a second line,
wherein a third capacitor is coupled to the gate of the second transistor and the first line, and
wherein the gate of the second transistor is configured to receive the first bias voltage via a third switch.
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