Mike Donnelly's picture

Automotive Start-Stop … Keep the lights ON!

You’ve probably noticed when you start your car that some of the optional electronics turn off, such as the radio and some LED lighting circuits. That’s because the high current draw of the starter motor pulls the system voltage far below the normal 12+ volt operating level. Critical circuits are designed to operate at these low voltages … if the ignition circuit didn’t work, you would be cranking for a very long time! But many functions are not designed for that low-voltage condition. After all, it’s a once-per-trip occurrence, and drivers expect the drop-out behavior.

Mike Donnelly's picture

TDFS Part 3 – Impedance Measurement for Switching Converters and Power System Stability Analysis

In this final installment of my series on TDFS (Time Domain Frequency Sweep) analysis, I’ll focus on measuring impedance vs. frequency. I’ll first demonstrate the method to measure the input impedance of switching power converters. Then I’ll extend that method to analyze the “impedance stability” of distributed power systems. These power systems may include many DC to DC converters, some acting as sources and other as loads. They may also be distributed over significant distances, so that the impedance characteristic of the interconnecting cables (a.k.a.

Craig Beebe's picture

The SystemVision® Cloud Import Tool Troubleshooting Guide

What Is This Import Tool You Speak Of?

It’s a plugin for Mentor PADS PCB tools that allows you to import the designs and components that you create here. There’s a great blog about it here.

Why Would I Need To Troubleshoot It?

We strive to automate as much of the import process as possible. However, there are a few scenarios that currently require some manual steps.

Mike Donnelly's picture

Is it a Wire or a Transmission Line?

Question: When is a wire or cable a transmission line?

Answer: When it is long enough that the propagation delay is significant to critical frequency content of the distributed system (i.e. it impacts the source and load electrical/electronic circuit dynamics).

Transmission line effects are a key design factor in many electrical engineering applications, including:

•    High-speed digital I/O over PCB traces

Darrell's picture

Controlling Motors with the Talon SRX

Do you struggle to understand how to use the Talon SRX controller effectively?  What is PID and PIDF?  How does feedback control work?  What is feed-forward control? How are values of P, I, D, & F determined? How is the new Talon SRX "motion profile" feature supposed to be used?  

If these are your questions, this blog is for you.  

Darrell's picture

Waveform Measurements Are Here!

Many of you have asked us to provide an easy way to analyze waveforms in SystemVision Cloud.  Well, the wait is over!

Watch this short video to see what you can do with these new Waveform Analysis Tools.

Mike Donnelly's picture

TDFS Part 2 – Closed Loop Stability Analysis for Switching and Sampled-Data Circuits and Systems

Stability is an essential quality of most practical circuits and systems. A traditional stability metric for closed-loop control systems is gain and phase margin, based-on the open-loop transfer function (OLTF) or frequency response. A special physical measurement technique for obtaining the OLTF of an operating closed-loop system, pioneered by Dean Venable* in the 1980s, involves injecting a small sinusoidal stimulus in series with the loop, and measuring the absolute signal levels at the injection site.

Mike Donnelly's picture

TDFS Part 1 - Gain and Phase Measurements for Switching and Mixed-Signal Circuits and Systems

SystemVision Cloud provides a family of measurement models that perform “Time Domain Frequency Sweep” (TDFS) analysis. They measure the frequency response of many circuits and systems for which traditional “AC” or frequency-domain simulation is not possible. This includes:

Darrell's picture

Import Your SystemVision Cloud Design Into the PADS PCB environment

SystemVision Cloud is designed to work with the Mentor PADS PCB tools.  If you have the PADS PCB tools, you can install an import tool into the schematic capture environment.  Using this import tool, you can login with your SystemVision Cloud account, from within the schematic environment, browse for your online designs, and import them into a PADS schematic.  

For an overview of this capability, visit the SystemVision PADS AMS Cloud page.

Mike Donnelly's picture

More Motor Models … Switched Reluctance and Stepper

In my previous blog, “Mechatronics Engineers … Start Your Motors”, I mentioned that we were working on two additional motor types, a Switched Reluctance Machine (SRM) and a Stepper Motor. I’m now happy to report that they have been added to our component library, under the category Magnetic and Electro-mechanical.


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