Analog 2:1 Multiplexer with over 110 GHz Bandwidth in SiGe BiCMOS Technology
Tobias Tannert, Markus Grözing, Manfred Berroth, Christian Schmidt, Jung Han Choi, Christoph Caspar, Jonathan Schostak, Volker Jungnickel, Ronald Freund, H. Rücker
Abstract
We report on a 2:1 analog multiplexer (AMUX) circuit in 130-nm SiGe BiCMOS technology. The technology offers HBTs with peak f <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</inf> of 470 GHz and f <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</inf> of 650 GHz. S-parameter measurements of the AMUX IC show a significant leap in bandwidth compared to the circuit in the previous technology generation. The linear signal path offers a 3-dB-bandwith beyond 110 GHz, while the limiting clock path has 85 GHz 3-dB-bandwidth. With this circuit two digital-to-analog converters (DACs) can be time-interleaved, to generate multi-level signals far beyond 100 GBaud with both high bandwidth and linearity.