A 1 Gb/s 8-channel array OEIC with SiGe photodetectors

A 1 Gb/s 8-channel array opto-electronic integrated circuit (OEIC) fabricated with SiGe photodetectors receives a 0.98 /spl mu/m photo signal. Monolithic integration of SiGe photodetectors and dc coupling between preamplifier and limiter, without an external capacitor, enables fabrication of small and low-cost optical receiver modules. For dc coupling, an offset cancel circuit with a mirror integrator produces a low-pass filter having a large time constant without an external capacitor and compensates the offset voltage. The receiver circuit operates with 3.3 V supply for low power dissipation and is surrounded by a trench for reduced crosstalk. A SiGe photodetector has 20% external quantum efficiency at 0.980 /spl mu/m. The receiver sensitivity is -10.4 dB.