A High Bandwidth Energy Efficient Linear Transimpedance Amplifier for Short-Range 100GBd PAM-4 Applications

We present a linear transimpedance amplifier with 67 GHz bandwidth. The amplifier has a maximum differential transimpedance of 72.5 dB-Ohm with automatic and manual gain control modes. For enhanced dynamic range, the IC includes input DC current regulation, as well as output DC offset correction using replica biasing. With an input-referred noise current density of 16.3 pA/sqrt(Hz) and power consumption of 193 mW, the presented circuit topology is suitable for short-range PAM-4 electro/optical communications.