A 16-QAM 100-Gb/s 1-M Wireless Link With an EVM of 17% at 230 GHz in an SiGe Technology

By Pedro Rodríguez-Vázquez, J. Grzyb, Bernd Heinemann, Ullrich R. Pfeiffer. IEEE Microwave and Wireless Components Letters, 2019

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This letter presents a 1-m wireless link established with a set of fundamentally operated Tx/Rx direct-conversion in-phase and quadrature (IQ) radio frequency (RF) front-end modules in a 0.13-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> SiGe HBT technology featuring full chip-on-board packaging. Using a 16-quadrature amplitude modulation, data rates from 20 to 100 Gb/s with an error vector magnitude from 7% to 17% were achieved at a 1-m distance. Thanks to the new mixer-first Rx, the maximum data rate improved from 90 to 100 Gb/s compared with our previous work using the amplifier-first Rx. The peak performance was reached at 230 GHz. The Tx operates at a 3.5 dB backoff from <inline-formula> <tex-math notation="LaTeX">$\text{P}_{\textbf {sat}}$ </tex-math></inline-formula> showing a 3-dB RF bandwidth (BW) of 28 GHz, a <inline-formula> <tex-math notation="LaTeX">$\text{P}_{\textbf {out}}$ </tex-math></inline-formula> of 5 dBm, and an IQ imbalance below 0.7 dB. The Rx features a peak conversion gain of 8 dB, a single-sideband noise figure of 14 dB, a 3-dB RF BW of 26 GHz, and an IQ imbalance below 1 dB. This letter also provides an analysis of the RF front-end imperfections related to the large link BW.

Subfields: Electrical and Electronic Engineering

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