CS-based TIAs using inductive feedback approach in 90nm CMOS

Abstract

In this paper, inductive feedback approach is applied for bandwidth extension of Common Source Transimpedance Amplifier. The effect of parasitic capacitances of the MOS transistor is reduced using this approach. The process of zero-pole cancellation for extending the bandwidth of the amplifier is explained. Moreover, a wideband three stage transimpedance amplifier based on common source amplifier is introduced. To demonstrate the feasibility of the technique, the transimpedance amplifiers are simulated in a well-known CMOS technology (i.e. 90nm STMicroelectronics). The single stage amplifier achieves 3-dB bandwidths of 32.1GHz, in the presence of a 50fF photodiode capacitances and 5fF loading capacitance while only dissipating 2.03mW. The three stage amplifier achieves bandwidths of 42.8GHz in the presence of 50fF photodiode capacitance and 5fF loading capacitance. The power consumption for the 3-stage transimpedance amplifier is 6.1mW. For all the structures noise performance is competitive in comparison with other works. Eye diagram evaluation for each topology shows the capability of the technique to pass high data rate effectively without inter symbol interference.