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Image sensor for improving linearity of analog-to-digital converter and image processing system including the same

  • US 10,084,982 B2
  • Filed: 03/31/2016
  • Issued: 09/25/2018
  • Est. Priority Date: 04/10/2015
  • Status: Active Grant
First Claim
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1. An image sensor comprising:

  • a pixel array comprising a plurality of pixels, each pixel of the plurality of pixels being connected to one of first through m-th column lines to output a pixel signal, where “

    m”

    is an integer of at least 2;

    a plurality of analog-to-digital converters, each analog-to-digital converter of the plurality of analog-to-digital converters being configured to receive the pixel signal corresponding to one of the first through m-th column lines, to compare the pixel signal with a ramp signal, and to convert the pixel signal to a digital pixel signal;

    a ramp signal generator configured to generate the ramp signal; and

    a ramp signal buffer configured to buffer and output the ramp signal; and

    a blocking circuit connected between the ramp signal buffer and an input terminal of at least one analog-to-digital converter of the plurality of analog-to-digital converters to block an influence of an operation of other analog-to-digital converters among the plurality of analog-to-digital converters.

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