Mike Engelhardt
NationalityAmerican
Alma materUniversity of Michigan (1981)
University of California, Berkeley (1983)
Occupation(s)Computer programmer, author
Known forLTspice software

Mike Thomas Engelhardt[1] is an American computer programmer, author, and entrepreneur.[2] He is renowned for developing the SPICE-based analog electronic circuit simulator computer software known as LTspice[3] and QSPICE.[4]

Personal life

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).[5]

He was Director of Simulation Development at Linear Technology, employed from March 1998 to December 2019.[5]

He is currently a managing member of Marcus Aurelius Software, which was started in January 2020.[5]

Software

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.[2]
  • 1998 – SwitcherCAD released internally at Linear Technology.[2]
  • 1999 – SwitcherCAD III released to public.[2] It ran on Windows 95, 98, 98SE, ME, NT4.0, 2K, XP.
  • 2008 – LTspice IV released.[2] It ran on Windows 2K, XP, Vista, 7. A native macOS 10.7+ application was introduced in 2013.
  • 2016 – LTspice XVII released.[2] It ran on 32 or 64-bit Windows 7, 8, 8.1, 10; and macOS 10.9+.
  • 2023 – QSPICE beta released.[4] Initially, it is designed to run on Windows 10 and 11.

Bibliography

The following is a list of articles and patents that Engelhardt 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.[6]
  • Design and Characteristics of a Magnetic Collimating Lens Spectrometer for Electron Beam Probing; Microelectronic Engineering (Elsevier); 6 pages; February 1996.[7]
  • SPICE Differentiation; LT Journal of Analog Innovation (Linear Technology); 7 pages; January 2015.[3]
Articles (coauthor)
  • Soft X-Ray Photoemission with the SSX-100 Spectrometer; Nuclear Instruments and Methods in Physics Research (Elsevier); 4 pages; May 1986.[8]
Patents
  • US Patent 7502723, filed in 2005, "Asymmetric minor hysteresis loop model and circuit simulator including the same".[1]
  • US Patent 8686702, filed in 2012, "Negative slope compensation for current mode switching power supply".[9]
  • US Patent 10637254, filed in 2015, "Spread spectrum for switch mode power supplies".[10]
  • US Patent 9866245, filed in 2016, "Active differential resistors with reduced noise".[11]
  • US Patent 10218394, filed in 2017, "Active differential resistors with reduced noise".[12]
Patents (coauthor)
  • US Patent 8274266, filed in 2009, "Switch mode power supply with dynamic topology".[13]
  • US Patent 9966832, filed in 2017, "Predictive ripple-cancelling signal into error amplifier of switch mode power supply".[14]
  • US Patent 10270330, filed in 2018, "Predictive ripple-cancelling signal into error amplifier of switch mode power supply".[15]

References

  1. 1 2 U.S. Patent 7502723.: "Asymmetric minor hysteresis loop model and circuit simulator including the same", filed September 1, 2005.
  2. 1 2 3 4 5 6 "LTspice Genealogy – The Heritage of Simulation Ubiquity". LTwiki. Archived from the original on December 2, 2018.
  3. 1 2 Engelhardt, Mike (January 2015). "SPICE Differentiation" (PDF). LT Journal of Analog Innovation. Linear Technology: 7 pages. Archived (PDF) from the original on May 17, 2018.
  4. 1 2 "Re-writing SPICE for a digital world". EE News Power. May 10, 2023. Archived from the original on May 14, 2023.
  5. 1 2 3 Mike Engelhardt; LinkedIn.
  6. ↑ Engelhardt, Mike (March 1992). "Design and Characteristics of a Lens Spectrometer with Electrostatic Extraction for Electron Beam Probing". Microelectronic Engineering. Elsevier: 6 pages.
  7. ↑ Engelhardt, Mike (February 1996). "Design and Characteristics of a Magnetic Collimating Lens Spectrometer for Electron Beam Probing". Microelectronic Engineering. Elsevier: 6 pages.
  8. ↑ "Soft X-Ray Photoemission with the SSX-100 Spectrometer". Nuclear Instruments and Methods in Physics Research. Elsevier: 4 pages. May 1986.
  9. ↑ U.S. Patent 8686702.: "Negative slope compensation for current mode switching power supply", filed February 15, 2012.
  10. ↑ U.S. Patent 10637254.: "Spread spectrum for switch mode power supplies", filed September 29, 2015.
  11. ↑ U.S. Patent 9866245.: "Active differential resistors with reduced noise", filed August 12, 2016.
  12. ↑ U.S. Patent 10218394.: "Active differential resistors with reduced noise", filed December 6, 2017.
  13. ↑ U.S. Patent 8274266.: "Switch mode power supply with dynamic topology", filed August 14, 2009.
  14. ↑ U.S. Patent 9966832.: "Predictive ripple-cancelling signal into error amplifier of switch mode power supply", filed May 9, 2017.
  15. ↑ U.S. Patent 10270330.: "Predictive ripple-cancelling signal into error amplifier of switch mode power supply", filed May 3, 2018.
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