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A CMOS differential transimpedance amplifier for gigabit optical communication
Author(s)
Date Issued
January 1, 2005
Type
Conference Paper
Abstract
In this paper, a CMOS differential transimpedance amplifier is presented. The basic amplifier employs fT doubler and compensation capacitor techniques to enhance the bandwidth. The shunt-shunt feedback configuration is used to compromise between the wide bandwidth of the low impedance design and the low noise performance of the high impedance design. The phantom zero introduced by the feedback network is used to position the pole in the desired region of the close loop systems. HSPICE is used to verify the circuit performance with a standard 0.5 μm CMOS technology and supply voltage of 2.5 V. Simulation results demonstrate the gain and the speed of operation of 80 dB and 3.25 Gb/s respectively. The equivalent input noise current spectral density is found to be 7.4 pA/ √Hz at 1 GHz and the total power dissipation is 29.6 mW.
Citation
7th International Conference on Advanced Communication Technology Icact 2005, 1, 293-297, 2005