Comparator and image sensor including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsSeonju LEE, Daehwa PAIK, Jaehong KIM
Life of this patent
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Abstract
Provided is a comparator of an image sensor, the comparator including a first input transistor configured to receive a reference signal, a second input transistor configured to receive an input signal, a first load transistor configured to output a first output signal to a first output node based on a difference between the reference signal and the input signal, and a first cascode transistor coupled to the first input transistor and the first output node.
Claims20
A comparator of an image sensor, the comparator comprising:
- a first input transistor configured to receive a reference signal;
- a second input transistor configured to receive an input signal;
- a first load transistor configured to output a first output signal to a first output node based on a difference between the reference signal and the input signal;
- and
- a first cascode transistor coupled to the first input transistor and the first output node.
An image sensor comprising:
- a pixel configured to output a pixel signal;
- a lamp generator configured to output a lamp signal;
- and
- a comparator configured to, based on an input signal corresponding to the pixel signal and a reference signal corresponding to the lamp signal, output a first output signal, wherein the comparator comprises:
- a first input transistor configured to receive a reference signal;
- a second input transistor configured to receive an input signal;
- a first load transistor configured to output a first output signal to a first output node based on a difference between the reference signal and the input signal;
- and
- a first cascode transistor coupled to the first input transistor and the first output node.
A method for comparing signals of an image sensor including a comparator, the method comprising:
- obtaining an input signal corresponding to a pixel signal and a reference signal corresponding to a lamp signal;
- outputting a first output signal based on a difference between the reference signal and the input signal;
- wherein the comparator comprises:
- a first input transistor configured to receive the reference signal;
- a second input transistor configured to receive the input signal;
- a first load transistor configured to output the first output signal to a first output node based on the difference between the reference signal and the input signal;
- and
- a first cascode transistor coupled to the first input transistor and the first output node.
Dependencies are inferred from the claim text.