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Imaging systems with column current mirror circuitry

  • US 8,952,311 B2
  • Filed: 04/24/2012
  • Issued: 02/10/2015
  • Est. Priority Date: 07/22/2011
  • Status: Active Grant
First Claim
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1. An image sensor, comprising:

  • an array of image pixels arranged in pixel rows and pixel columns;

    a plurality of active current supply circuits; and

    a plurality of inactive current supply circuits, wherein at least one of the plurality of inactive current supply circuits and a corresponding one of the active current supply circuits are coupled to an associated one of the pixel columns, wherein the at least one of the plurality of inactive current supply circuits and the corresponding one of the active current supply circuits are coupled in parallel to the associated one of the pixel columns, wherein each image pixel in each pixel column comprises;

    a photosensitive element; and

    a source follower transistor having a gate terminal coupled to the photosensitive element, wherein the source follower transistors of the image pixels in each pixel column are configured to receive a bias current from the active current supply circuit that is coupled to that pixel column, wherein, in combination with additional circuitry on the image sensor, each of the active current supply circuits forms a corresponding current mirror circuit for providing the bias current, and wherein the current mirror circuit corresponding to each of the active current supply circuits comprises a feedback-assisted current mirror circuit.

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