Light sensor

  • US 9,961,746 B2
  • Filed: 10/28/2015
  • Issued: 05/01/2018
  • 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 light-to-pulse circuit in communication with the exposed light transducer, the light-to-pulse circuit operative to output a pulse having a pulse width based on the charge accumulated by the exposed light transducer; and

    a bandgap voltage reference circuit for receiving power from a power source and for generating a set of stable reference voltages to the light-to-pulse circuit, wherein the bandgap voltage reference circuit generates a constant current from the supply voltage supplied by the power supply and wherein the bandgap voltage reference circuit comprises a resistive ladder through which the constant current is passed to generate the set of stable reference voltages.

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