Design Of Low-Noise Pre-Amplifier Of 10Gbps Optical Receiver

The traditional wire transmission become hard to satisfy the increasing needs since it has high consumption and poor capacity.On the other hand,optical communication has less consumption and is faster and more stable,and has a wide range of applications.Most of the fiber communication systems in China bases on 10 Gbps optical chips.The optical receiver is an important module in fiber communication,and the pre-amplifier which effects on the performance of the receiver plays an important role in the system.It is ever so important to do a research for a pre-amplifier of the optical receiver.Basing on the principle of the front-end of an optical receiver,the system-level design and the circuits of each module are proposed.The system contains a trans-impedance amplifier(TIA),a differential amplifier,an automatic generation controller(AGC)and an output driver.An improved common-source structure is used in TIA and gives a better noise performance.The active inductance peaking technique is used in differential amplifier which creates a wider bandwidth.Two active points are set in AGC which limit the output of TIA to 200 mV.The work is designed with SMIC 0.13?m technology.When working under the 2V voltage and the 0.25 pF capacitance of optical detector,the result of the simulation turns out that the bandwidth of the design circuit is 8.06 GHz,the gain is 63.0dB?,the noise is 19.65pA/?Hz which completely fits the require of an 10 Gbps optical receiver.The pre-amplifier proposed in this work has a better noise performance comparing to other works,which increases the quality of the signal and also contributes to the transfer range of fiber communication.