Light sensor

  • US 9,207,116 B2
  • Filed: 02/12/2013
  • Issued: 12/08/2015
  • Est. Priority Date: 02/12/2013
  • Status: Active Grant
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First Claim
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1. A light sensor comprising:

  • an exposed light transducer operative to accumulate charge in proportion to light incident on the exposed light transducer over an integration period;

    a shielded light transducer shielded from light, the shielded light transducer having substantially the same construction as the exposed light transducer, the shielded light transducer operative to accumulate charge in proportion to noise over the integration period; and

    a light-to-pulse circuit in communication with the exposed light transducer and the shielded light transducer, the light-to-pulse circuit operative to output a pulse having a pulse width based on the difference between the charges accumulated by the exposed and shielded light transducers, wherein the light-to-pulse circuit includes a one shot logic circuit that contributes to a generation of the pulse.

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