Patent ID: 7705285

Claim:
A photodetector arrangement having a semiconductor body comprising: a substrate, a first layer at a first main surface of the semiconductor body, the semiconductor body being adapted for receiving incident photon radiation to be detected, a second layer at a second main surface of the semiconductor body, the second main surface being remote from the first main surface, first and second measurement terminals which are arranged at the second main surface on edge regions of the second layer that are remote from one another and are formed for external electrical contact-connection of the second layer, and first and second transistors for electrically coupling the second layer to the first and the second measurement terminals, respectively, wherein an output representing an x-coordinate of a position of incidence site of a light beam is obtained from the level of the first and second measurement currents flowing through the first and second measurement terminals, respectively, in accordance with the relationship: X = Dx 2 ⁢ Ia - Ib Ia + Ib where x is the x-coordinate of the position of incidence, Dx is the distance between the first and second transistors, Ia is the first measurement current flowing through the first measurement terminal and Ib is the second measurement current flowing through the second measurement terminal.