Light sensor
First Claim
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.
0 Assignments
0 Petitions
Accused Products
Abstract
A light sensor is provided that includes an exposed light transducer for accumulating charge in proportion to light incident thereon over an integration period; and 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. The light-to-pulse circuit may include a one shot logic circuit that contributes to generation of the pulse. The light sensor may include an input/output pad, a capacitor provided at the input/output pad for blocking static electricity, an input low pass filter provided at the input/output pad for blocking electromagnetic interference, and/or a bandgap voltage reference circuit connected to a power source having a supply voltage level in a range of about 3.3V to about 5.0V, and for generating a set of stable reference voltages throughout the supply voltage level range.
176 Citations
10 Claims
-
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. - View Dependent Claims (2, 3, 4, 5)
-
-
6. 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 having a supply voltage level in a range of about 3.3V to about 5.0V, and for generating a set of stable reference voltages throughout the supply voltage level range to the light-to-pulse circuit. - View Dependent Claims (7, 8, 9, 10)
-
Specification