Abstract
The GigaBit Transceiver (GBT) is a high-speed optical transmission system currently under development for HEP applications. This system will implement bi-directional optical links to be used in the radiation environment of the Super LHC. The GigaBit Transimpedance Amplifier (GBTIA) is the front-end optical receiver of the GBT chip set. This paper presents the GBTIA, a 5 Gbit/s, fully differential, and highly sensitive optical receiver designed and implemented in a commercial 0.13 µm CMOS process. When connected to a PIN-diode, the GBTIA displays a sensitivity better than 19 dBm for a BER of 10 12 . The differential output across an external 50 load remains constant at 400 mVpp even for signals near the sensitivity limit. The chip achieves an overall transimpedance gain of 20 k with a measured bandwidth of 4 GHz. The total power consumption of the chip is less than 120 mW and the chip die size is 0.75 mm x 1.25 mm. Irradiation testing of the chip shows no performance degradation after a dose rate of 200 Mrad.
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