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CMOS image sensor with noise cancellation

  • US 7,612,817 B2
  • Filed: 06/14/2004
  • Issued: 11/03/2009
  • Est. Priority Date: 11/06/2001
  • Status: Expired due to Fees
First Claim
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1. An image sensor, comprising:

  • a photodetector;

    an output transistor having a gate coupled to receive a signal from said photodetector;

    a reset transistor having a drain terminal coupled to reset said photodetector;

    a sample circuit coupled to receive an output signal from said output transistor; and

    a control circuit having a configuration to switch said reset transistor to a triode region such that said output transistor provides a sampled first reference output signal and to subsequently switch said reset transistor to an OFF state such that said output transistor provides a sampled reset output signal that has a voltage different from a voltage of said sampled first reference output signal and a configuration to switch said sample circuit to sample and store said sampled first reference output signal when said reset transistor is in said triode region and to sample and store said sampled reset output signal when said reset transistor is in said OFF state.

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