Design and simulation of differential transimpedance amplifier with active feedback for optical receivers

An active feedback network-based bandwidth extension technique for CMOS differential transimpedance amplifier (TIA) is proposed in 0.18 mu m CMOS process technology. The design consists of three stages in differential mode. The first stage is a common-source amplifier that minimizes noise. A common collector stage is used for level shifting and buffering in the second stage. The third stage is a differential amplifier that provides additional gain. In addition to these three stages, an active CMOS negative feedback circuit is used for extending the bandwidth. The proposed design achieves a gain of 45.2 dB omega with a 3 dB bandwidth of 21.23 GHz. The active feedback circuit provides an additional bandwidth of 7.3 GHz. The TIA achieves a data rate of 30 Gb/s with input-referred noise current density of 63.1 pA/ Hz $\sqrt{\mathrm{Hz}}$ and jitter of 9.07 ps. The TIA consumes a power of 10.3 mW with a supply voltage of 1.8 V.