A 25-Gb/s Active Feedback Transimpedance Amplifier in 65-nm CMOS

This paper presents a regulated cascode (RGC) based trans-impedance amplifier (TIA) using an active feedback topology. The circuit topology of the proposed TIA improves the gain by applying a gain boosting amplifier to a local feedback section in our previously proposed TIA. The TIA was implemented using a 65-nm CMOS technology and consumes 24.5 mW with a supply voltage of 1.0 V. The proposed TIA had also 25 Gb/s data rate operation.