Patent ID: 8222591
Filing Date: 2012-07-17
Classification: G01J,G01S,H03K

Abstract:
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; wherein the controller and the ADC with the ADA feedback are configured to