Column-parallel sigma-delta analog-to-digital conversion for imagers

Column-parallel sigma-delta analog-to-digital conversion for imagers

  • CN 101,160,953 B
  • Filed: 04/12/2006
  • Issued: 03/27/2013
  • Est. Priority Date: 04/15/2005
  • Status: Active Grant
First Claim
Patent Images

1. current sensing circuit that is used for imager, described current sensing circuit comprises:

  • The first circuit branch, it is used for, and signal voltage is reseted in input and electric current is reseted in formation;

    The second circuit branch road, it is used for the input pixel signal voltage and forms pixel current;

    AndRegulate branch road, it be used for to use to form to the ∑

    of the resistance of described adjusting branch road-Δ

    modulation and according to reference voltage adjusts electric current, when described electric current and the described pixel current reseted when unequal, described adjustment electric current and the described electric current of reseting merge, and electric current and described pixel current through merging are compared, make described electric current through merging equal described pixel currentThe modulated number of times of wherein said resistance is corresponding to described pixel signal voltage and describedly reset poor between the signal voltage.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×