1/12/2024: AEi Systems Releases Power IC Model Library for Cadence PSpice 4.5, Adds SIC & Germanium Diodes, IGBTs, References & Regulators, Opamps, and more; Now over 1700 Models AEi Systems, the world leader in worst case circuit analysis (‘WCCA’) and SPICE modeling, has released version 4.5 of AEi Systems’ Power IC Model Library for the Cadence® PSpice® simulator. In addition to several key Power ICs, the updated library includes a variety of new models including many semiconductors (diodes, IGBTs, FETs, BJTs, and zeners), references and regulators, beads, capacitors and more. Version 4.5 of the Power IC Model Library now has over 1,700 high fidelity and correlated simulation models for power electronic designs. It includes model netlists in PSpice syntax, schematic symbols for both Cadence OrCAD® Capture and legacy schematics, and a set of example application circuits for many of the IC models. The models are compatible with the latest OrCAD Capture version 17.x software.

3/05/2018: AEi Systems Releases Power Library 4.3 - Adds EMC Transient Sources for Automotive WCCA AEi Systems, the world leader in worst case circuit analysis (‘WCCA’) and SPICE modeling, has released version 4.3 of AEi Systems’ Power IC Model Library for the Cadence® PSpice® simulator. The updated library now has a full suite of EMC transient sources and loads used in automotive WCCA including all of FORD’s FMC1278 requirements.

Models are included for CI 210, 220, 221, 222, 230, 231, 250, 260 and 280 immunity and ESD simulation.

“This update marks a milestone in our efforts to support automotive worst case analysis” said Charles Hymowitz, managing director at AEi Systems. “Over the last few years we have seen a tremendous growth in the performance of WCCA by OEMs and all tiers in the supply chain. A substantial amount of effort was employed to develop these models which have supported the analysis we do for our automotive WCCA customers. And now those performing their own WCCA can take advantage.”

The sources encompass the Ford FMC1278, ISO 7637-2, and ISO 16750-2 standards for electromagnetic compatibility and environmental conditions for electrical and electronic components and subsystems. The sources are used as stimulus and loading in nominal and worst case simulations covering the potential environmental stresses and specifies tests and requirements required by Ford WCCA guidelines.

The FMC1278requirements have been developed to assure compliance with present and anticipated regulations in addition to customer satisfaction regarding the EMC of vehicle E/E systems. FMC1278 is applicable for all 12 and 24 volt DC E/E components/subsystems that are planned for use on 2020 Ford vehicle programs and beyond. Note: FMC1278 is available for download from the Ford Standards Management System (FSMS) in addition to www.fordemc.com.


4/24/2018: AEi Systems Gives Papers on Migrating from Si to GaN and Power Integrity Lessons Learned at Space Power Workshop

Steve Sandler will be presenting a paper on Migrating to GaN at the 2018 Space Power Workshop in Manhattan Beach CA.

GaN is being promoted as the next generation silicon that wins in every metric including, size, weight, cost, radiation performance and efficiency. There seems to be a lot of confusion about what it means to migrate from Si to GaN. It isn’t as simple as just swapping out the Si MOSFETs for GaN MOSFETs, though it is simpler to migrate linear regulators to switching regulators. Not every topology is GaN friendly and not every topology will see a performance increase.

This paper will introduce the migration of linear and switching regulators, from Si to GaN, along with some of the challenges and trade-offs encountered along the way. Three things about GaN that will be discussed.


• GaN is CRAZY fast
• Why you’ll need a good EM simulator
• How to deal with EMI which is typically at higher frequencies than SI

Charles Hymowitz will be presenting a paper on Lessons Learned about Power Integrity. Power Integrity is driving design performance. On the other hand, most designers and programs have not realized they need to have a Power Integrity plan before the design is set. With each new generation of high speed digital and RF chips and circuitry, designs are expected to perform at higher frequencies while the supply voltages are being reduced to meet new power efficiency goals. As the result, circuits have become increasingly sensitive to power supply noise and power delivery network (‘PDN’) impedance mismatches. As voltage margins have decreased, even minor variations in the supply voltage interacting with the VMRs and PCB designs have large detrimental impacts on system performance. This also means that heritage results are no longer necessarily valid as a performance baseline. Therefore, the ability to test, characterize, model, simulate and optimize the performance of your power supply, PDN, and their integral components, is crucial for a successful design.

3/26/2018: Switched-Mode Power Supply Simulation with SPICE Book Faraday Press announces the reprint of Switched-Mode Power Supply Simulation with SPICE, Supports VRM Modeling for Power Integrity – Faraday Press (Apache Junction, AZ) announces the reprint of Steve Sandler’s, book entitled Switched-Mode Power Supply Simulation with SPICE. Steve is the CTO of AEi Systems.



Topics include areas vital to power supply designers, including Magnetics, EMI Filter Design, Buck and Flyback Topologies and Power Factor Correction designs, as well as, Power Integrity (PDN) analysis such as VRM modeling.

The retail price is USD $59.95, but a discount is offered here

The ISBN is 978-1-941071-84-7

To request additional information or a review copy of this book, please write to:
Ken Coffman, Publisher, Faraday Press
1000 West Apache Trail, Suite 126
Apache Junction, AZ 85120 Ken@StairwayPress.com

April 27, 2017: New Video - The Unfortunate State of Power Integrity in Space Systems
This video slideshow is from a recent presentation by Steve Sandler at the 2017 Space Power Workshop in Manhattan Beach, CA on April 27, 2017. The importance of power integrity cannot be underestimated.

Click here for more details.

AEi Systems Releases Power Library 4.2 - Add Automotive Models
(January 4, 2017) – AEi Systems, the world leader in worst case circuit analysis (‘WCCA’) and SPICE modeling, has released version 4.2 of AEi Systems’ Power IC Model Library for the Cadence® PSpice® simulator. “We’ve spent over 1,000 man-hours testing, simulating, and optimizing the new models in this release,” said Charles Hymowitz, managing director at AEi Systems. “Overall we’ve invested about 17,000 hours creating and verifying the models in this library.”


4/21/2016: AEi Systems Gives Paper on DDR Regulators at Space Power Workshop
Steve Sandler will be presenting a paper on DDR Termination Regulators at the 2016 Space Power Workshop in Manhattan Beach CA.

The DDR termination regulator is the most complex regulator application to date, pushing the boundaries of performance with possibly insurmountable stability issues. In this presentation we’ll consider the linear termination regulator solution and the complexity of the stability issue. Using a custom developed DDR termination regulator measurement board, measurements are performed to show the non-linearity and stability issue as well as the complexity of determining the maximum voltage excursion. The paper will be given on Thursday April 21 at 8am, so please make plans to be there early.

The schedule of Presenters can be found here.

AEi Systems Releases RH1959 Switcher SPICE Model, Supports PDN Assessment for FPGAs
(9/13/2013) The newly released model is a state space average model capable of performing both transient (step load), as well as frequency domain (stability, PSRR) simulations. The model is correlated to the M.S. Kennedy MSK5059RH radiation hardened adjustable output voltage switching regulator EVM’s performance. Correlation data is available upon request.