A Low-Power CMOS Trans-Impedance Amplifier for 2.5 Gb/S Optical Communication Systems

Subject Areas : Low-power devices

Mojgan Mohseni ¹ ( MSc /Najafabad Branch, Islamic Azad University )
Mehdi Dolatshahi ² ( Assistant Professor/Najafabad Branch, Islamic Azad University )

Received: 2012-11-19 Accepted : 2013-04-11 Published : 2013-03-01

Keywords: CMOS, Transimpedance amplifier, optical communications,

Abstract :

This Paper presents a new Trans-impedance amplifier for optical receiver circuits. The amplifier is based on parallel (R-C) feedback topology which is optimized for power consumption and uses shunt-peaking technique to enhance the frequency bandwidth of the amplifier. However, the circuit is designed and simulated using 0.18µm CMOS technology parameters. As simulation results show, the amplifier has a gain of 67.5dBΩ, bandwidth of 3GHz while consumes only 12.16 mW power which shows a very good performance for using in a 2.5Gb/S (SONET OC-48) optical communication system. Finally, as the simulated Eye-Diagram shows, the circuit has a very good performance for a 2.5Gb/S system for a 10µA input current.