TRANSIMPEDANCE-TYPE ELECTRONIC DEVICE, FIBER-OPTIC COMMUNICATION SYSTEM HAVING SUCH DEVICE, AND METHOD OF OPERATING SUCH DEVICE

摘要

An electronic device, a fiber-optic communication system comprising the electronic device and a method of operating the electronic device are provided. The electronic device comprises a transimpedance-type amplifier having a transimpedance stage (14) comprising an amplifier (4) which is coupled in series with an input node (IN). A feedback resistor (RF) is coupled in series between an output node of the amplifier and an inverting input node of the amplifier to provide a virtual ground node which is coupled to the input node, the inverting input node of the amplifier and to the feedback resistor. A current source (22) is coupled to the virtual ground node so as to compensate for an offset current in an input signal (IS) which is coupled to the input node of the electronic device. Further, the electronic device comprises a control stage which is configured to control the current source as a function of a current through the feedback transistor.