TRANSIMPEDANCE AMPLIFIER WITH BANDWIDTH EXTENDER

摘要

A transimpedance amplifier with an input configured to receive a current input from an upstream device and output configured to present an output voltage. In one configuration, there are three amplifier stages in the transimpedance amplifier connected in series. A feedback path with feedback resistor connects between the input and output of the transimpedance amplifier. A bandwidth extender circuit connects between a stage output and a stage input of the transimpedance amplifier. In a three-stage embodiment, the bandwidth extender circuit extends between an input of the second stage and the output of the second stage. The bandwidth extender includes at least one active device configured to provide positive feedback to increase gain. The bandwidth extender circuit may be automatically or selectively deactivated to filter unwanted frequency components.