Karl Küpfmüller, 1928: an early time-domain, closed-loop, stability criterion

Bissell, C.C. (2006). Karl Küpfmüller, 1928: an early time-domain, closed-loop, stability criterion. IEEE Control Systems Magazine, 26(3) pp. 115–116.

DOI: https://doi.org/10.1109/MCS.2006.1636314

Abstract

Karl Küpfmüller, (1897-1977) was a German engineer who began his professional career in the comparatively young telecommunications sector just after the First World War. During the 1920s, he worked for eight years at Siemens & Halske in Berlin. From 1928 onward, he held academic posts in electrical engineering, culminating as the chair of telecommunications in Darmstadt until 1963. While employed at Siemens & Halske, Küpfmüller carried out fundamental work on telegraphy and telephony, network theory, and electrical signal transmission. Like his U.S. contemporary Harry Nyquist, Küpfmüller derived fundamental results in information transmission and closed-loop modeling, including a stability criterion.

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