Transimpedance amplifier circuit for converting an input current to an output voltage such circuits used for the evalutation of output signals of photo detectors, which are generating a current that is proportional to the intensity of received light

摘要

The invention relates to a transimpedance amplifier circuit for converting an input current into an output voltage U_out−, comprising an amplifier element (4) having at least one signal input and an output having the output voltage U_out. For this purpose, the transimpedance amplifier circuit has a T-shaped feedback network divided into at least a first branch (1), a second branch (2) and a third branch (3), which is connected in series with the first branch (1), thus producing a node (K). The first branch (1) has a non-reactive resistance (R1) and is connected to the output at one end and the node (K) at the other end. The second branch (2) has at least one capacitance C₂ and is connected to the node (K) at one end and in particular to an earth at the other end, and the third branch (3) has at least one capacitance C₃ and is connected to the node (K) at one end and to the signal input at the other end. As a result, a capacitive current division is effected at the node (K).