Low Noise And Low Power Transimpedance Amplifier using Inverter Based Local Feedback

The large data that needs to be transferred has led to an high usage of optical communication systems. In optical communication system Transimpedance amplifiers (TIA) plays a very important role. TIA are used at thr receiver side of optical communication system to convert the current obtained from photodiode to amplified voltage Thus obtained appropriate voltage signal is processed in further stages of communication system. A TIA should have high bandwidth and low power consumption but due to large photodiode capacitance it is difficukt to achieve. This paper presents a transimpedance amplifier (TIA) circuit with high gain and wide bandwidth with vey low noise effect. Author has used inverter based feedback system with always on PMOS and NMOS to reduce the leakage current for nanoelectronics application and increase the bandwidth for wide band and high-speed application. With this topology achieved -3db bandwidth is 8.2 GHz with high gain of 53.2dBohms. The noise effect is 23.36pA/sqHz i.e very low compared to other topologies in 180nm design. The author had used current mirror instead of constant current source thus power dissipation is also very low i.e 3.6mW. Thus this TIA can be used efficiently in low power high band 10Gb/s applications