Circuit for increasing output direct-current level of transimpedance amplification stage in TIA

A circuit for increasing an output direct-current level of a transimpedance amplification stage in a TIA (Trans-Impedance Amplifier), comprising a transimpedance amplification stage, a differential amplification stage, a level boosting unit, and a DC-restore loop;

• an input terminal of the transimpedance amplification stage being used for inputting a photocurrent signal, an output terminal of the transimpedance amplification stage being directly connected to an input terminal of the differential amplification stage;
• the DC-restore loop including a pseudo transimpedance amplification stage, a first filter unit, a second filter unit, a DC-restore operational amplifier and a DC path unit, the transimpedance amplification stage and the pseudo transimpedance amplification stage are connected in parallel between a power supply VDD and the level boosting unit, the output terminal of the transimpedance amplification stage being connected to an inverting input terminal of the DC-restore operational amplifier through a first filter circuit, an output terminal of the pseudo transimpedance amplification stage being connected to a non-inverting input terminal of the DC-restore operational amplifier through the second filter unit, an output terminal of the DC-restore operational amplifier being connected to the DC path unit, the DC path unit being further connected to the input terminal of the transimpedance amplification stage.