A CMOS Auto-High Background Immunity Position-Sensitive Detector (PSD) for High Background Light Environment

In this paper, a CMOS auto-high background immunity position-sensitive detector (PSD) is newly used for high background light environment. The proposed approach can successfully solve the impact of high background light on PSD. As proven by simulations, if the problem of high background light on PSD in real environment is not solved, the maximum linear error of the PSD will be over 45.25% when the intensity of background light becomes higher than 5 nA. After performing the proposed auto-high background light immunity circuits, the maximum linear error can be reduced to below 1% while the intensity of background light is 40 nA. The proposed PSD could be used for high background light environment.