Broadband SiGe HBT Amplifier Concepts for 40 Gbit/s Fibre-Optic Communication Systems

Abstract

Distributed single-ended, distributed differential and lumped differential circuit concepts for realisation of linear broadband amplifiers are presented. Concept advantages and disadvantages are discussed. Demonstration circuits of the first two kinds have been fabricated, the third one being currently in fabrication. All three circuits utilise the same SiGe HBT technology. The amplifiers' 3 dB cut-off frequencies range from 32 GHz to 41 GHz. They are intended for use in 40 Gbit/s optical communication systems.

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“…Tuning the values of e R and e C  , introduces trade-off between high gain, bandwidth and stability, because e C influences the capacitive load of the cascaded emitter followers. Inductive peaking is carefully applied using small inductors C L in the collector branches in order to avoid high group delay [41]. In order to achieve a high output swing, high currents in the differential amplifier are necessary.…”

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