×

PROXIMITY SENSORS WITH IMPROVED AMBIENT LIGHT REJECTION

  • US 20110006188A1
  • Filed: 03/02/2010
  • Published: 01/13/2011
  • Est. Priority Date: 07/07/2009
  • Status: Active Grant
First Claim
Patent Images

1. A proximity sensor, comprising:

  • a driver adapted to selectively drive a light source;

    a photodiode (PD) adapted to produce a photodiode current signal (Idiode) indicative of an intensity of light detected by the PD, where the light detected by the PD can include ambient light and/or light transmitted by the light source that was reflected off an object proximate the PD;

    an analog-to-digital converter (ADC) with analog-to-digital-to-analog (ADA) feedback; and

    a controller adapted to control the driver and the ADC with ADA feedback;

    wherein a digital output of the ADC with ADA feedback is indicative of a proximity of an object to the PD with at least a majority of the ambient light detected by the PD rejected.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×