NEW - Lessons Learned from SPICE
Space Power Workshop Presentation, May 8, 2014. Accurate analysis relies to a large degree on accurate SPICE models and modeling capabilities. This presentation highlights many of the issues surrounding IC vendor and EDA software vendor supplied SPICE models. Several examples of poor vendor supplied models and modeling pitfalls are included.

NEW - AEi Systems Component Test and Model Summary
This document contains SPICE model correlations; bench test compared with SPICE simulation results for magnetics (88uH inductor, seven output flyback power transformer), passive and active components (tantalum capacitors, 2N6059 BJT, IRHNM57110 FET), and various regulators (LM120/LM140). This report gives a good indication of AEi System’s ability to accurately model components and ICs.

NEW - Definitive Handbook of Transistor Modeling
Techniques and Examples for modeling BJTs and Diodes. Includes Parameter definition and impact on data sheet curves.

SPICE Model Supports LDO Regulator Designs
SPICE models of power MOSFETs may prove inadequate in applications such as low dropout regulator designs. This article identifies shortcomings and defines an improved SPICE model. The new model is used to simulate results, which are then compared with measurements made from a prototype built for that purpose.

An Improved SPICE Capacitor Model
In the world of power conversion, not all capacitors are created equal. In many circuits the characteristics of the capacitors dominate the performance of the circuit.

SPICE 3 Compatible Core Model
A magnetic core model has three major elements; permeability, hysteresis, and core loss. Unfortunately, both the permeability and the core loss are nonlinear functions. The models in this paper properly represent the non-linear permeability and the hysteresis.

Non-Linear Saturable Kool Mu Core Model
Iron Powder cores have been well suited for applications such as switching regulator inductors, in-line noise filters, and flyback converter transformers, where high flux density capacity is the key characteristic in the magnetic core performance. This article details the development of a nonlinear core model.

Minerr function aids SPICE modeling
Almost any SPICE package employs model statements to describe elements it considers primitives. Yet generating a SPICE model for even a simple device becomes quite complex due to the number of variables that describe a typical component. However, you can simplify the process by tapping into the functionality of a general-purpose scientific analysis package like Mathcad.

SPICE accurately models zeners
Zeners seem simple, but engineer generally don't know how to characterize and properly use them. Indeed, zener characteristics change dramatically depending on operating conditions. This article details the development of a subcircuit based Zener model.

Extracting SPICE parameters from a diode using two M3500A

Comparing SPICE to the Bench
One of the most important aspects of circuit analysis and simulation is the resulting accuracy of the mathematical circuit representation. AEi Systems prides itself on the time proven accuracy of our SPICE models.

PSPICE Modeling For WCCA
Simulation and analysis of analog circuits is normally addressed using three basic tools; a SPICE simulator, a mathematical analysis package, and Microsoft Excel. This article discuses some of the pitfalls with using PSpice and how to correct common convergence problems.

Model Speeds Simulation of Complex Controller
A novel approach to SPICE modeling of a two-phase synchronous step-down controller shortens startup simulation runtime from hours to minutes. Developing a SPICE model for National Semiconductor's LM2642 presents some significant challenges. This device, a two-phase, two-output synchronous step-down controller, is complex and contains a sophisticated soft-start, as well as several control loops, multiple channels and an internal clocking scheme that forces the SPICE time step to remain in the nanosecond region.