We present a novel bandwidth enhancement technique for a transimpedance amplifier (TIA). The proposed TIA utilizes a common source topology and adopts the current mirror configuration using flipped voltage follower to increase the open-loop gain for the enhanced bandwidth with positive feedback. Circuit simulation results show that the proposed TIA makes it possible to increase the open-loop gain and enlarge the bandwidth by 40% compared with the conventional TIA.

This paper presents a new Gain-Adder (GA) circuit for Current-Reuse (CR)-RGC TIA. The proposed GA circuit employs one transistor alone to enhance bandwidth and decrease power consumption. The proposed CR-RGC TIA circuit is designed in a 65-nm CMOS technology. The simulation results confirmed that the proposed CR-RGC TIA circuit improves bandwidth by 83% and decreases the power consumption by 34% in comparison with the conventional one.