A Multi-Stage TIA based on Cascoded-Inverter Structures for Low-power Applications

Abstract

This article discusses a multi-stage transimpedance amplifier (TIA), which is based on three stages of a modified inverter structure. The traditional inverter structures’ performances are improved adding two cascoded transistors. This new structure benefits from elimination of the Miller-capacitances in comparison with the traditional inverters, which can provide higher speed and wider frequency bandwidth. Manipulating the trade-offs among bandwidth, gain and power consumption beside using G_m/I_D technique, this paper introduces a low-power transimpedance amplifier for high-bit rates in optical communication receiver systems. Moreover, active types of inductors are also used to lesson the occupied area and increase the frequency bandwidth. Transferring poles of the improved circuit to higher frequencies means less required DC current for a fixed bandwidth range, which results in low-power characteristic.