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B. Mesgari, N. Vokic, B. Goll, B. Pichler, D. Milovancev, K. Schneider-Hornstein, H. Arthaber, H. Zimmermann:
"38.5 Gb/s RoF Based Optical Receiver for 5G Mobile Remote Radio Head Applications";
Talk: Austrochip, Wien; 2020-10-07; in: "2020 Austrochip Workshop on Microelectronics", (2020), ISBN: 978-1-7281-8493-7; 5 pages.

A 38.5 Gb/s optical receiver has been fabricated in a 130 nm SiGe-BiCMOS technology for being employed in a Radio over Fiber transceiver for 5G remote radio head application. As a transimpedance topology, a common base amplifier is used to provide a low resistance input impedance to relax connecting a photodiode with relatively high capacitance. The transimpedance amplifier (TIA) is followed by the capacitive degeneration limiting amplifier to create a degree of freedom and relax the trade-off between the gain-bandwidth product and the linearity of the receiver. Analytical methods have been investigated to provide a low-noise and high gain design. Calibrated S-parameter measurement has been done which represents a 27-GHz 3-dB bandwidth with a differential gain of 49 dBΩ with a total power consumption of 160 mW for the entire receiver. The optical receiver has also been tested in the time domain by using a 35-GHz photodetector with a responsivity of 0.1 A/W and a capacitance of 90 fF. Eye diagram measurements have revealed that the optical receiver can provide a BER of 6.37×10^-6, 1.3×10^-4, and 1.7×10^-3 for a data rate of 15, 25, and 35 Gb/s at an input current of 32μ A respectively. The fabricated receiver occupies an area of 930μ m × 930μ m including bond pads.

Radio over Fiber (RoF), 5G cellular communication, remote radio head (RRH), low noise optical receiver

http://dx.doi.org/10.1109/Austrochip51129.2020.9232992