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A 0.18µm CMOS 2.5Gbps pre-amplifier with AGC

Shaoheng Lin

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Abstract

A 2.5Gbps pre-amplifier for OC-48 / GPON optical fiber communication application is implemented in 0.18µm Mixed Signal CMOS process. The pre-amplifier utilities RGC structure as input buffer stage, shunt-shunt feedback structure as trans-impedance amplifier, and employs active inductive peaking and source degeneration technologies to extend bandwidth, builds in AGC block to extend the input dynamic range. The simulation results show that, the differential gain is 6Kohm, the bandwidth is 2GHz; the practical test results of the chip show that, the optical input sensitivity is about −26dBm under a BER of 10−10, and the overload optical input is 3dBm. The chip is powered by a single 3.3V supply, and the static power dissipation is only 66mW.

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What this paper is about

A 2.5Gbps pre-amplifier for OC-48 / GPON optical fiber communication application is implemented in 0.18µm Mixed Signal CMOS process. The pre-amplifier utilities RGC structure as input buffer stage, shunt-shunt feedback structure as trans-impedance amplifier, and employs active inductive peaking and source degeneration technologies to extend bandwidth, builds in AGC block to extend the input dynamic range. The simulation results show that, the differential gain is 6Kohm, the bandwidth is 2GHz; the practical test results of the chip show that, the optical input sensitivity is about −26dBm under a BER of 10−10, and the overload optical input is 3dBm. The chip is powered by a single 3.3V supply, and the static power dissipation is only 66mW.

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Available abstract

A 2.5Gbps pre-amplifier for OC-48 / GPON optical fiber communication application is implemented in 0.18µm Mixed Signal CMOS process. The pre-amplifier utilities RGC structure as input buffer stage, shunt-shunt feedback structure as trans-impedance amplifier, and employs active inductive peaking and source degeneration technologies to extend bandwidth, builds in AGC block to extend the input dynamic range. The simulation results show that, the differential gain is 6Kohm, the bandwidth is 2GHz; the practical test results of the chip show that, the optical input sensitivity is about −26dBm under a BER of 10−10, and the overload optical input is 3dBm. The chip is powered by a single 3.3V supply, and the static power dissipation is only 66mW.

Key concepts: CMOS, Amplifier, Chip, Computer science, Bandwidth (computing), Electrical engineering, Automatic gain control, Direct-coupled amplifier

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