This image showsTim Vollmer

Tim Vollmer

M. Sc.

Research staff member
Institute of Electrical and Optical Communications
IC group

Contact

+49 711 685 67932
+49 711 685 67900

Business card (VCF)

Pfaffenwaldring 47
70569 Stuttgart
Germany
Room: 2.401

Subject

My research focuses on developing new circuits to further increase data transfer speeds in high-speed optical communication systems. The digital-to-analog converters (DACs) in CMOS technology that are most commonly used for this purpose are reaching their limits when it comes to the high symbol rates that are being targeted. In order to increase the data rate for the next generation of optical communication links, I am developing an analog multiplexer chip (AMUX) that combines the output signals of two DACs in a time-interleaved manner to form a signal with twice the symbol rate. In addition to a very high bandwidth, the chip should also have a large output voltage swing so that optical modulators (MZM) can be driven directly. The AMUX is being developed in SiGe BiCMOS technology and has a target output symbol rate of 300 GBd with a differential output voltage swing of 2V.

  1. 2025

    1. M. Grözing, S. Özbek, J. Großholtfurth, S. Wazynski, T. Vollmer, S. Michel, and G. Rademacher, “Design of 200 GBd 22-nm CMOS-based and 300 GBd SiGe-HBT-based Analog Multiplexers,” in IEEE Photonics Society Summer Topicals Meeting Series (SUM), 2025, p. WB3.
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