【TALK】July 23rd, Design Exploration of Wideband Inverter-Based Transimpedance Amplifiers
- Title: Design Exploration of Wideband Inverter-Based Transimpedance Amplifiers
- Date: July 23, 2025 (Wednesday)
- Time: 14:00~16:00
- Location: EC1004
- Registration: Please fill in the form below by July 13.
- Abstract:
Optical data transmission is of paramount importance in our interconnected world. Global submarine internet cables, as well as data center interconnects, employ glass fiber to transmit optical signals. The transimpedance amplifier plays a critical role in the optical-to-electrical conversion chain, serving as the bridge between the optical channel and the electrical processing unit. Cutting-edge optical transport networks and interconnects operating at 100 Gbit/s and beyond require power-efficient, wideband conversion circuits with high linearity to support advanced signal modulation techniques.
Within the scope of this talk, we first explore the TIA’s system surroundings to develop an intuitive understanding of the input signal and output conditions. We then delve into the design flow of an inductively bandwidth-extended CMOS transimpedance amplifier. Different TIA circuits will be discussed and various inductive bandwidth-extension techniques get compared and combined to offer a perspective on the trade-offs between different architectures. Following the theoretical analysis, a practical design implementation is presented. - Speaker bio
Jendrik Kellermann received his B.Sc. and M.Sc. degrees in Electrical Engineering from Technische Universität Berlin in 2022 and 2025, respectively. During his studies, he focused on analog integrated circuits and data transmission systems. Highlights of his academic work include the design of an active body-biased operational transconductance amplifier in 22 nm FDSOI CMOS technology (bachelor thesis), the development of an 105 GHz opto-electronic voltage-controlled oscillator in 130 nm SiGe BiCMOS technology (internship at IHP – Leibniz Institute), and the design of a wideband 112 Gbit/s PAM4 transimpedance amplifier in 22 nm FDSOI technology for his master’s thesis.
During his master's studies, he also worked at IC4X GmbH, gaining hands-on experience in analog circuit design. In 2025, he joined the Chair of Mixed-Signal Circuit Design at Technische Universität Berlin, where he is conducting research in the field of energy-efficient wideband opto-electronic interface circuits.
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