A wide dynamic range transimpedance amplifier with high gain-bandwidth product for 10 Gb/s optical links

Abstract

This paper presents the design method and implementation of a wide dynamic range transimpedance amplifier (TIA) with high gain-bandwidth product (GBW) based on 1μm GaAs process of WIN company. The wide dynamic range results from the utilization of a parallel feedback structure that divides the input current when it is large. And the high GBW owes to the limiting amplifier (LA) which functions as a gain stage based on a modified Cherry-Hopper amplifier. The proposed TIA achieves a maximum input current of 3.5 mA and a transimpedance of 68.6 dBΩ and a bandwidth of 10.9 GHz.