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CMOS active pixel with reset noise reduction

  • US 6,777,660 B1
  • Filed: 02/04/2002
  • Issued: 08/17/2004
  • Est. Priority Date: 02/04/2002
  • Status: Expired due to Term
First Claim
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1. An image sensor comprising:

  • a plurality of pixels each having an output, each pixel including;

    a first circuit that produces a signal proportional to incident light intensity, said first circuit being connected to supply said proportional signal to said pixel output, a select node connected to receive a select signal for selecting said pixel from said plurality of pixels, and a reset transistor for resetting said pixel;

    an amplifier having;

    a first input for receiving said outputs of said pixels, and an output connected to said pixels to be actively coupled to said reset transistors during a pixel reset phase to provide a negative feedback signal to a selected pixel during said pixel reset phase; and

    a reset reference voltage source connected to apply a reset reference voltage signal to said amplifier to provide a voltage reference for controlling reset of said pixels.

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