This paper presents a novel Trans-Impedance Amplifier (TIA) based on Regulated-Cascode (RGC) structure. Amodified MOS-based Immittance Converter (MIC) is used to achieve high bandwidth with lower powerconsumption. Combining the MIC scheme with RGC structure, in the presence of an inductor, provides both anegative input resistance which increases the input pole frequency and a negative inductance which improvesstability of the circuit. As a result, -3 dB bandwidth enhances while consuming lower power. Post-layoutsimulation results in TSMC 0.18 μm CMOS technology show a trans-impedance gain of 49.7 dB with -3dBbandwidth of 9.2 GHz considering 500 fF of photodiode capacitance at the TIA input. The circuit occupies anactive area of 0.068 mm2 and consumes 5.3 mW from a 1.8-V supply. The minimum input-referred currentnoise of the TIA is about 15.3 pA/√Hz.
