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Questions tagged [eda]

Electronic design automation (EDA) tools are software packages to assist with electronic design. Common examples include schematic capture, PCB design, circuit anaylsis and chip level design tools.

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Finding specific components in EDA software

I'm looking for the best protocol for finding specific parts in EDA software? I've been mainly using EasyEDA for the past few months and have enjoyed how easy it is to search parts in the libraries ...
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1answer
731 views

What is the difference Verilog race condition, X's propagation and Metastability?

I'm trying to understand Verilog Race Condition X's propagation and Metastability with http:/...
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2answers
94 views

Schematic to PDF [closed]

I have 3 schematics files. I want to convert those to PDF format. I don't have the full version of software that can do it. Is there any other way to do the conversion? The free trial version is ...
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1answer
43 views

Kicad: Drag with left button mouse click by default when working with Eeschema

I want to change default behavior of left mouse click when working with Eeschema. Is it possible to change it from Move (M key) -> Drag (G key) when I select one/many elements? I'm using KiCAD 5.0 on ...
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1answer
80 views

Eagle - Custom pad shape for SMT inductor

I'm trying to make the following footprint in Eagle for an SMT inductor: I understood how to make D-shape pads and similar, but this is driving me nuts: my idea was to enclose a pad into a polygon ...
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1answer
126 views

Machine learning for floorplanning

I have an educational assignment to make an floor-planning tool. Can I use machine learning in some part of the algorithm? For example, I was reading the book Algorithms for VLSI Physical Design ...
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0answers
44 views

Eagle or Gerber ground plane analysis

I was wondering if anyone knows of a simple tool that gives you something like a heat map that is resistance to ground of different parts of the ground plane in a PCB. What I am particularly after is ...
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0answers
70 views

Reversed silk screening on EasyEDA

Just a quick one. I'm not sure if the text should be mirrored on the bottom layer of EasyEDA. It seems okay in the 3D preview, but when I upload the gerber to JLC their preview shows it still reversed....
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1answer
55 views

Accidentally Pasted Beyond Origin in Altium

I'm new in Altium and I accidentally pasted some pads and components(the ones at the bottom corner) from another pcb file but I wasn't aware of it at first because it didn't show on the sheet on the ...
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1answer
277 views

PCB power supply layout considerations

I'm designing a circuit that steps down 230v AC to 12v DC and then uses an MCP73213 IC to charge a 7.4v li-po battery. There is also functionality to switch over to the battery supply if there is no ...
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0answers
48 views

CADSTAR PCB layout pad name

I am new to CADSTAR. But I have learned a lot in 2 months. I have the Schematic as shown. But when I generate the PCB file , I don't see the IC pad name/ number.(Marked in the following picture with ...
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2answers
163 views

DC solution failed using EasyEDA

I am trying to simulate an IR sensor circuit as described here: https://circuitdigest.com/electronic-circuits/ir-sensor-circuit-diagram I am using EasyEDA for this purpose, and the following is my ...
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0answers
48 views

How can I calculate/estimate the resistance of the thin film structured like in the picture (top view)?

let's say the thin film is made of metal with resistivity rho and thickness t. I need to calculate the sheet resistance between point A and B. any reference suggestion is really appreciated.
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0answers
38 views

Advanced library format(ALF) in ASIC layouting

I have in some places worked with layout tools, where you could export .lef/.def files from your design. Now I was introduced to the .alf which seems from its capabilities to be superior to lefdef, ...
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2answers
51 views

MT03-004 EDA Library

Currently working on my Honours project, we're designing a wide area sun sensor for an attitude control system of a picosatellite platform. We've elected to implement a COtS quad-photodiode package, ...
1
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1answer
363 views

Ungrouping synthesized modules in Synopsys Design Compiler for better synthesis results

I have a large multi-input multi-output design where each primary output is written in terms of primary inputs. Because the design is so large, DC is unable to synthesize the circuit. A ...
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2answers
1k views

Singular matrix warning

I faced some errors while trying to simulate a circuit. I tried to simplify it, but errors still stayed in place :| The following error message is what I get: ...
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2answers
178 views

What is this section category in Model Library Setup in Cadence Virtuoso ADE L?

I usually leave it at default while constructing circuit in Cadence Virtuoso. I didn't really understand what it is or why it is used for.
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2answers
38 views

System-level, mixed signal hardware description language (HDL) and software (editor, simulator)?

I am looking for devices (conceptual / software) to simplify and unify our current method of industrial control system planning and documentation, especially to help with debugging. This is currently ...
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1answer
240 views

Altium VersionControl_RevNumber special string

I have encountered a rather strange problem in Altium Designer 17.1. I am using the special strings VersionControl_RevNumber and VersionControl_ProjFolderRevNumber to keep track of our PCB Revisions ...
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2answers
232 views

Can the same net-list file be used for ASIC design flow as well as FPGA design flow?

I have mostly worked on front-end part and don't know much about back-end stuff. I have gone through the reading about the various abstraction levels of design flows of FPGAs and ASICs. I was ...
3
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2answers
976 views

Solder mask resist on extra large through hole pads

I'm adding extra copper area for more thermal heat on through hole components pads. I now wonder if it's okey to have the solder resist overlapping the edge of this extra large copper area and what ...
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2answers
1k views

How to copy a polygon in eagle from one layer to multiple others in library (package) editor?

I have to layout kind of several boiler plates for layouts. I thought of designing it as a package in the library editor. Some drawing elements have to be present on any layer and some other have to ...
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2answers
191 views

Altium select component

When I select some components in file ".sch" and then in file ".pcb" Altium will focus them and remaining components are still diplayed normally. But I only need to display the ones I selected and ...
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2answers
3k views

Merge Altium Schematic Libraries (and PCB libraries)

I want to combine two Altium schematic libraries into one, eliminating any duplicates as defined by the symbol reference. There is a command to remove duplicates in a library as so: Unfortunately, ...
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2answers
118 views

How do electronic design tools work [closed]

I'm looking for some insight into how something like multisim actually works. If I understand correctly it has spice under the hood but how does it actually analyze the circuits? Is there some ...
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2answers
583 views

How to copy attributes between package variants in eagle library editor

I have entered a set of attributes into a eagle library. However I started to enter the data after having drawn all package variantes. The package variants are only different pad layouts I use for ...
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2answers
323 views

Low cost FPGA and EDA tools? costs?

I have a small floating point unit, described in VHDL, and synthesizable. I'd like to buy an FPGA (not an expensive one) that would allow me to test in practice the unit. I've used an FPGA in the ...
6
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1answer
5k views

Why Cadence not revealing their prices for their software product? [closed]

I contacted the Cadence office as a PhD student and also a faculty member to inquiry their price for an academic license. After 8 emails back and forth I noticed that they are not willing to answer ...
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1answer
170 views

Virtuoso Monte Carlo Inductor Problem

For an LNA design, the simulations for the inductors and the simulation for the rest of the components (transistors, capacitors, resistors etc.) are done in two different software packages. The ...
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5answers
975 views

Circuit board without EDA

For me there is no doubt that one of the most time consuming tasks when it comes to produce a new board is going from a ratsnest to the final layout. I must admit I am not an expert, but to me it ...
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1answer
262 views

Altera Quartus. Technology Map Viewer looks different from expected

Recently, I've installed Altera Quartus 15.1 and now follow the "getting started" instructions, you can read it here. At the step: to see the resulting circuit go to Tools →Netlist Viewers →Technology ...
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2answers
41 views

Behaviour defined in eagle when naming a gate like an orientation

I'm pondering about a possibly undefined behaviour in eagle. Let's say you have a device named testdevice containing a gate named R90. If you call ...
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1answer
33 views

Schematic representation for net connected to specific component

I have a board with a +5V trace from a current sense resistor across a noisy +5V plane to an OpAmp, so I thought I'd shave that particular yak soon and create a few symbols for KiCad that actually ...
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4answers
762 views

What method do you suggest for prototyping asynchronous circuits?

I got surprised and to a degree shocked by finding that there is no proper established tool for designing and prototyping asynchronous circuits. I keep searching using google and other means to find ...
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2answers
77 views

Transistor level netlist benchmarks

I'm PhD student in CAD/EDA field. My research topic covers VLSI standard cell's layout design and detailed routing. To make my research results more reliable, I would like to test proposed algorithm ...
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1answer
478 views

Polygon pour error in Altium

I am using Altium (Ver 14). I designed the board and all seemed fine. But, when I edited the same PCB today, it behaves funny. I have quite a few polygons on my PCB. Previously the polygon would ...
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3answers
1k views

Altium Issue: PCB Switch Pad Nets for Rubber Button

I am currently trying to create a component in Altium for a rubber keypad switch. This will be like the ones in TV remotes etc where there are a mesh of fingers connected when the conductive pill ...
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2answers
2k views

Altium Designer, Solder mask layer

I designed my first PCB and had it manufactured, but there was no solder mask on the manufactured PCB. Is there a specific setting that i need make in order to enable the solder mask layer? I am using ...
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1answer
126 views

extract gate level netlist from layout

My project is to extract a gate level netlist from layout, I am going write a parser for GDSII file format. However, I have trouble in relating the record information represented in the GDSII format ...
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1answer
599 views

“Functional Blocks” in kicad

I have a schematic that I'm making that uses the same "block" multiple times. I would like to design that block only once, and then use it in a bunch of different places, so I can edit the block if I ...
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1answer
2k views

Altium de-highlighting nets after using 'Find Similar Objects…' command

I can't work out why Altium is doing this, or how to undo it, or how to make it stop doing it. It happens when I use the 'Find Similar Objects... ' option; all of objects that it hasn't found are ...
8
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2answers
22k views

Import Gerber files into Altium

Question I would like to import Gerber files into an Altium Designer PCB document for re-using an in-PCB spiral inductor but the importer fails to interpret the Gerber files in a correct way. Has ...
8
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1answer
840 views

What's the meaning of the “key” symbols in Altium?

I'm routing a PCB board with Altium. Today I find when my mouse hover on the pads, it shows some shadowed "key" symbols. What's the meaning of them?
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2answers
3k views

How to rotate 3D body around X axis in Altium Designer

I have a simple question about Altium Designer 13.1, to what I could not find the answer so far. How can I rotate a 3D body object around the X axis? I have checked at here and on Google without any ...
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3answers
3k views

How to fix my warning in OrCAD?

I'm doing a schematic on OrCAD and when I did the Design Rules Check I got a warning that says: Checking Electrical Rules WARNING(ORCAP-1608): Net has no driving source N30274 I have a fairly ...
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1answer
244 views

Kicad footprint for right angle mount with 2 circular through holes

Currently I have created a footprint by using one large retangular pad + 2 through holes. However the DRC picks this up as an error. Is there a better or more correct way to do this? Or is the DRC ...
3
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4answers
2k views

Are there good free software analog filter design tools? If not, why?

I'm finding myself needing to do a fair bit of analog filter design. Mostly passive LC ladder filters. I honestly don't know much about how to design them by hand, I've been using the Genesys tool. ...
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1answer
436 views

recalculate delay from fsdb file

I came across hsim help menu and I found these two switches pretty interesting. ...
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1answer
148 views

Component Guide Pins on PCB Footprint

I've just been working my way through and getting more experienced with Altium, I've almost got it doing exactly what I need for my design. The last thing I can't figure out is how to define the guide ...