Analog-to-digital converting circuit for decreasing decision delay and operation method thereof

    公开(公告)号:US12167158B2

    公开(公告)日:2024-12-10

    申请号:US18062853

    申请日:2022-12-07

    Abstract: An analog-to-digital converting circuit includes a first amplifier configured to output a first output signal by comparing a pixel signal output from a pixel array with a ramp signal, and a second amplifier configured to generate a second output signal based on the first output signal. The second amplifier includes a first transistor configured to provide a power supply voltage to a first output node in response to the first output signal, a second transistor connected with a capacitor through a bias node, wherein the second transistor is configured to turn on in response to an auto-zero signal, a current source connected with the first transistor through the first output node, the current source configured to generate a power current based on a voltage level of the bias node, and a third transistor connected with the current source.

    A/D Converter including comparison circuit and image sensor including same

    公开(公告)号:US20220116564A1

    公开(公告)日:2022-04-14

    申请号:US17470187

    申请日:2021-09-09

    Abstract: An A/D converter and an image sensor are disclosed. 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 according to a result of comparing the pixel signal with the ramp signal, to a first circuit node; a limiter including an n-type transistor having one end connected to the first circuit node and an opposite end to which power supply voltage is applied; and a second comparator stage configured to generate the comparison result signal by shaping the first stage output signal.

    A/D converter including comparison circuit and image sensor including same

    公开(公告)号:US11627276B2

    公开(公告)日:2023-04-11

    申请号:US17470187

    申请日:2021-09-09

    Abstract: An A/D converter and an image sensor are disclosed. 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 according to a result of comparing the pixel signal with the ramp signal, to a first circuit node; a limiter including an n-type transistor having one end connected to the first circuit node and an opposite end to which power supply voltage is applied; and a second comparator stage configured to generate the comparison result signal by shaping the first stage output signal.

    IMAGE SENSOR AND IMAGE PROCESSING DEVICE INCLUDING THE SAME

    公开(公告)号:US20240107195A1

    公开(公告)日:2024-03-28

    申请号:US18240483

    申请日:2023-08-31

    CPC classification number: H04N25/771 H04N23/667 H04N25/531 H04N25/532

    Abstract: An image sensor comprising a pixel array in which a plurality of pixels are arranged and a row driver . Each of the pixel includes a photodiode, a transfer transistor for transferring photocharges of the photodiode to a floating diffusion node (FD), a conversion gain control transistor, a first source follower for amplifying and outputting the voltage of the FD to a first node, a precharge selection transistor connected between the first node and a second node, a first capacitor, a first sampling transistor connected between the second node and the first capacitor, a second capacitor, a second sampling transistor connected between the second node and the second capacitor, a second source follower for amplifying a voltage of the second node, a first selection transistor connected between the second source follower and a column line, and a second selection transistor connected between the first node and the column line.

    ANALOG-TO-DIGITAL CONVERTING CIRCUIT FOR DECREASING DECISION DELAY AND OPERATION METHOD THEREOF

    公开(公告)号:US20230345152A1

    公开(公告)日:2023-10-26

    申请号:US18062853

    申请日:2022-12-07

    CPC classification number: H04N25/78 H04N25/709

    Abstract: An analog-to-digital converting circuit includes a first amplifier configured to output a first output signal by comparing a pixel signal output from a pixel array with a ramp signal, and a second amplifier configured to generate a second output signal based on the first output signal. The second amplifier includes a first transistor configured to provide a power supply voltage to a first output node in response to the first output signal, a second transistor connected with a capacitor through a bias node, wherein the second transistor is configured to turn on in response to an auto-zero signal, a current source connected with the first transistor through the first output node, the current source configured to generate a power current based on a voltage level of the bias node, and a third transistor connected with the current source.

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