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Pixel sensor column amplifier architecture

  • US 6,476,864 B1
  • Filed: 05/11/1998
  • Issued: 11/05/2002
  • Est. Priority Date: 05/11/1998
  • Status: Expired due to Term
First Claim
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1. A pixel column sensor for creating a reduced noise differential image signal comprising:

  • a first and a second double sampling (DS) circuit, each having a first and a second sample period;

    the first DS circuit having an input coupled to an image signal that is subject to a set of noise components, an output outputting a first side of the reduced noise differential image signal, and a reference input;

    the second DS circuit having an input coupled to a reference image signal that is held in a reset state and is subject to the set of noise components, an output outputting a second side of the reduced noise differential image signal, and a reference input;

    a reference voltage source coupled to the reference inputs of the first and second DS circuits; and

    wherein the reference voltage is sampled during the first sample time period in the first and second DS circuits.

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