Concept
Mike Engelhardt (Michael Thomas Engelhardt) is an American computer programmer, inventor (8 patents), author, entrepreneur. He developed the SPICE-based analog electronic circuit simulator computer software LTspice and QSPICE. LTspice is the most widely distributed and used SPICE software in the industry. Mike grew up in rural Michigan. His college degrees are: Bachelors in Physics (1981) from University of Michigan (Ann Arbor, Michigan, United States); Masters in Physics (1983) from University of California, Berkeley (Berkeley, California, United States). He was Director of Simulation Development at Linear Technology, employed from March 1998 to December 2019. He is currently a managing member of Marcus Aurelius Software, started in January 2020. Mike has written simulators since 1975. The following is a list of software which Mike was either the sole or primary developer: 1992 – First known port of SPICE (3E2) to Linux. 1998 – SwitcherCAD released internally at Linear Technology. 1999 – SwitcherCAD III released to public. It ran on Windows 95, 98, 98SE, ME, NT4.0, 2K, XP. 2008 – LTspice IV released. It ran on Windows 2K, XP, Vista, 7. A native macOS 10.7+ application was introduced in 2013. 2016 – LTspice XVII released. It ran on 32 or 64-bit Windows 7, 8, 8.1, 10; and macOS 10.9+. 2023 – QSPICE beta released. Initially, it is designed to run on Windows 10 and 11. The following is a list of articles and patents that Mike authored or coauthored. Articles Design and Characteristics of a Lens Spectrometer with Electrostatic Extraction for Electron Beam Probing; Microelectronic Engineering (Elsevier); 6 pages; March 1992. Design and Characteristics of a Magnetic Collimating Lens Spectrometer for Electron Beam Probing; Microelectronic Engineering (Elsevier); 6 pages; February 1996. SPICE Differentiation; LT Journal of Analog Innovation (Linear Technology); 7 pages; January 2015. Articles (coauthor) Soft X-Ray Photoemission with the SSX-100 Spectrometer; Nuclear Instruments and Methods in Physics Research (Elsevier); 4 pages; May 1986.