Tag Archives: Spice

An almost-GHz active differential oscilloscope probe

 

assembled-probe

Christer wanted to see how a 500MHz differential clock was behaving so he decided to build an active probe. To simulate the circuit he used TINA spice software and documented the process in three parts on his website.

What I really wanted was an active differential probe which should be able to look at a 500MHz signal at a couple of volts or so with decent fidelity. To do that I wanted a probe with about one GHz of usable bandwidth. I have an old Tektronix 11801B scope with two 20 GHz sampling heads with 50Ω single ended inputs that can handle signals which are 1.0V peak-to-peak so that’s what I wanted the probe output to be compatible with. The probe must attenuate the signal so to not overdrive the inputs and to make things easy to calculate I decided on letting the probe have a 1:10 attenuation.

An almost-GHz active differential oscilloscope probe – [Link]

WEBENCH now with PCB Export

Webench

by elektor.com:

Any experienced engineer will tell you that power supply design is not a trivial exercise and bad design often leads to poor system reliability. For more than a decade now engineers have been able to use the Texas Instruments WEBENCH design tools to streamline power supply design.

The online software allows designers to quickly create, optimize and simulate a complete design using calculation algorithms and the SPICE simulator tool provided by the WEBENCH Power Designer software. Careful PCB layout can also be critical for power supply performance. Texas Instruments have now added PCB Export to the WEBENCH suite of design tools. This allows engineers to run electrical and thermal simulations to characterize their designs, create a power supply PCB layout, and export it to Altium, Cadence Design Systems, Inc., CadSoft Computer, Mentor Graphics and RS Components CAD platforms.

According to the press release WEBENCH Power Designer together with PCB Export will help reduce PCB board design time from hours to minutes and take into account best layout practices to reduce noise and thermal issues.

WEBENCH now with PCB Export – [Link]

EasyEDA – Web based design tool

EasyEDA is a Web-Based EDA, schematic capture, spice circuit simulation and PCB layout Online. [via]

EasyEDA launches a free, zero-install, Web and cloud-based EDA tool suite, integrating powerful schematic capture, mixed-mode circuit simulation and PCB layout in a seamless cross-platform browser environment, for electronic engineers, educators, students and hobbyists. EasyEDA has extensive built-in schematic, spice and PCB libraries which can be easily extended using powerful symbol, model and footprint creation and editing tools.EasyEDA has integrated with DangerousPrototypes’ open source libraries, so the makers can build electronic stuff with DangerousPrototypes parts in EasyEDA easily.

EasyEDA – Web based design tool – [Link]

Docircuits.com – Experience virtual labs for electronics on browser

Docircuits.com – Build, simulate, and share your circuits, entirely in your browser — no install required. Experience Online Electronics Lab. Work with real looking equipments and components. Learn About Circuits. Build circuits, Run, Analyse and Save them in easy steps. Learning circuits have never been this easy with powerful SPICE-like, mixed-mode circuit simulation helps EE students, electronics hobbyists, and electrical engineers learn faster.

Docircuits.com – Experience virtual labs for electronics on browser – [Link]

Spicy Schematics for PC, Mac and iPad

The first and only circuit schematic capture and simulation program to offer an intuitive, touch-based schematic capture system with real spice simulation capability.

Spicy Schematics is the latest in circuit design. Create, edit, and simulate circuits on your iPad, and sync your files from any Mac or PC using Spicy for Web! … Advanced features such as the Online Circuit Library, and Spice Model Upload Service make Spicy way ahead of the curve. Check out our videos on YouTube, User Manual, Example Circuits Page, and FAQ for more info! Download Product Flyer.

Spicy Schematics for PC, Mac and iPad – [Link]

CircuitLab – browser-based schematic editor and circuit simulator

circuitlab.com writes:

We are happy to announce the release of CircuitLab, a browser-based schematic editor and circuit simulator.

With CircuitLab you can sketch your circuits as easily as you would on a piece of paper, and then simulate your circuit right in your browser to see how it would work in real life! You can then tweak, design, and iterate — all in one tool, all in your web browser.

CircuitLab has powerful SPICE-like device models, and the simulation engine supports mixed-mode analog and digital components side-by-side, so you can rapidly test your ideas for a wide range of possible projects. In addition to DC calculations and time-domain simulation, CircuitLab also has many advanced simulation capabilities, including frequency-domain (small signal) analysis, stepping through circuit parameters, and arbitrary Laplace transform function blocks.

CircuitLab is completely web-based, which not only means itʼs cross-platform (Windows/Mac/Linux) and requires no installation or plug-ins, but also means that all you the circuits you choose to make public can be shared by just copy & pasting a URL!

Instead of the usual forum posts with static screenshots from different desktop tools, the online electronics community can use CircuitLab to share useful URLs (as well as PNGs and PDFs) which link directly to interactive, editable, runnable schematics. In just a few clicks, another hobbyist can open that circuit, make a change, simulate it, and post the new version back to the community.

CircuitLab is now available publicly at https://www.circuitlab.com. Make sure you check out the Quick-Start Circuits for some great examples of what CircuitLab can do!

CircuitLab – browser-based schematic editor and circuit simulator – [Link]

iSchematics.com – Spice Simulation and Schematics for iPad!

SPICY Schematics is a revolution in electronic circuit schematic capture

Spicy takes full advantage of mobile technologies for circuit design – the first tablet application to offer real Spice simulation and advanced sharing and online backup features.

SPICY is fast, intuitive, and allows you to literally draw circuits with your fingers. Create, save, edit, share, simulate, export and send screen-shots to email, SPICY is a must have for students and working engineers alike.

iSchematics.com – Spice Simulation and Schematics for iPad! – [Link]

LTSpice simulation of Chua's circuit

juho-eric.blogspot.com writes:

I had been reading on chaos generators in the past, and this e-mail got me interested again. Their design is somewhat complicated, with a total of 13 stages of 7 different circuit blocks. You can read all about it in the PDF they published

A much simpler chaos generator that can be built with a lot less components is called Chua’s circuit. The downside with this simple circuit is that you need an inductor which you might have to wind up yourself. Also there should be much less variety than in the waveforms of the Elektor circuit. It has so many stages that can saturate to give different waveforms.

Still, Chua’s circuit is very interesting to fiddle with. I haven’t built the circuit yet, but I did some simulations with LTSpice IV and here’s what I found out.

LTSpice simulation of Chua’s circuit – [Link]

LTSpice simulation of Chua’s circuit

juho-eric.blogspot.com writes:

I had been reading on chaos generators in the past, and this e-mail got me interested again. Their design is somewhat complicated, with a total of 13 stages of 7 different circuit blocks. You can read all about it in the PDF they published

A much simpler chaos generator that can be built with a lot less components is called Chua’s circuit. The downside with this simple circuit is that you need an inductor which you might have to wind up yourself. Also there should be much less variety than in the waveforms of the Elektor circuit. It has so many stages that can saturate to give different waveforms.

Still, Chua’s circuit is very interesting to fiddle with. I haven’t built the circuit yet, but I did some simulations with LTSpice IV and here’s what I found out.

LTSpice simulation of Chua’s circuit – [Link]