40 Gbit/s transimpedance amplifier in SiGe bipolar technology for the receiver in optical-fibre TDM links

A transimpedance amplifier for a 40 Gbit/s optical-fibre electrical TDM system has been realised in an advanced SiGe bipolar technology. Despite its high gain (transimpedance of 2 kΩ in the limiting mode) the complete amplifier of the receiver was put on a single chip. Clear output eye diagrams at a constant (limited) output voltage swing of 0.6 Vp-p were measured at 40 Gbit/s.