Patent ID: 8848202
Filing Date: 2014-09-30
Classification: G01C,G01S

Abstract:
1. An optical proximity sensor used to detect the presence, proximity and/or motion of an object within a sense region of the optical proximity sensor, comprising: a driver that selectively drives a light source to transmit light; a light detector that produces an analog detection signal indicative of an intensity of light detected by the light detector, wherein the light detected by the light detector includes an offset signal generator that selectively produces an analog offset signal that is combined with the analog detection signal produced by the photodetector to produce an analog compensated detection signal; and an analog-to-digital converter (ADC) that converts the analog compensated detection signal to a digital compensated detection signal; wherein the analog offset signal compensates for at least a portion of the interference light included in the light detected by the light detector; and wherein a dynamic range of the ADC is increased by the analog offset signal being combined with the analog detection signal to produce the analog compensated detection signal upstream of the ADC, compared to if the analog offset signal is not combined with the analog detection signal to produce the analog compensated detection signal upstream of the ADC.