Patent ID: 8097853
Filing Date: 2012-01-17
Classification: B60S,G01S

Abstract:
1. A method to accommodate a photodiode current generated by a signal light from a light source in presence of ambient light, comprising the following steps: (1) providing a light receiving photo diode receiving a signal light pulse from a light source and a front end system comprising a continuous-time programmable transresistance amplifier converting input current through multi-scaled feedback resistors into a voltage, a digital unit, an analog-to digital converter and a digital-to-analog converter; (2) calibrating said front-end system by digitally correcting each raw output of the analog-to-digital converter while the photo diode is disconnected; (3) extracting offset for ambient light compensation; (4) accommodating the ambient light compensation; (5) accommodating compensated ambient light and signal light pulse; (6) go back to step (2) if system is ON, otherwise go to step (7); and (7) end.