US Patent 9577753 Transimpedance amplifier

A TIA comprises a TIA core that converts a current signal to a voltage signal, a single-to-differential converter that generates a differential voltage signal from the voltage signal, a feedback circuit that generates a control signal from the differential voltage signal, a bypass circuit that generates the current signal by subtracting the bypass current from the input current so that an average value of the current signal is maintained at a predetermined value, and a monitor circuit that generates a monitor current proportional to the bypass current from the control signal.