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From: Guilherme Brondani Torri <guitorri@gm...>  20140629 18:53:20

On 6/15/14, 2:34 PM, Guilherme Brondani Torri wrote: > Hi qucsdevel, qucshelp, > > I uploaded a new snapshot/experimental Qucs package for Mac OSX 10.7 > and greater [1]. It only includes ASCO. > The respective uninstall script can be fund in [2]. > > Packages for OSX 10.5 and 10.6 are in preparation. A few code changes > are needed due to libstc++ vs libc++ incompatibilities. > > I don't have an environment for OSX 10.4, one can compile from source > with the help of MacPorts [3]. Donation of binary packages are welcome. > > It contains a few known bugs as in [4]. > If you are willing to test, I appreciate your feedback ;) > > Regards, > Guilherme > > [1] > http://sourceforge.net/projects/qucs/files/qucsbinary/0.0.18snapshots/qucs0.0.18140614gitbaf813dmin_osx10.7.pkg/download > [2] > http://sourceforge.net/projects/qucs/files/qucsbinary/0.0.18snapshots/uninstallqucspkg.sh/download > [3] https://sourceforge.net/p/qucs/discussion/311050/thread/a11165c7/ > [4] https://sourceforge.net/p/qucs/bugs/ > > > Hi, A test package of Qucs (including ASCO) for OSX 10.6 can be found in: http://sourceforge.net/projects/qucs/files/qucsbinary/0.0.18snapshots/qucs0.0.18140629git4da5a364bit_osx10.6.pkg/download Regards, Guilherme 
From: Guilherme Brondani Torri <guitorri@gm...>  20140615 12:34:49

Hi qucsdevel, qucshelp, I uploaded a new snapshot/experimental Qucs package for Mac OSX 10.7 and greater [1]. It only includes ASCO. The respective uninstall script can be fund in [2]. Packages for OSX 10.5 and 10.6 are in preparation. A few code changes are needed due to libstc++ vs libc++ incompatibilities. I don't have an environment for OSX 10.4, one can compile from source with the help of MacPorts [3]. Donation of binary packages are welcome. It contains a few known bugs as in [4]. If you are willing to test, I appreciate your feedback ;) Regards, Guilherme [1] http://sourceforge.net/projects/qucs/files/qucsbinary/0.0.18snapshots/qucs0.0.18140614gitbaf813dmin_osx10.7.pkg/download [2] http://sourceforge.net/projects/qucs/files/qucsbinary/0.0.18snapshots/uninstallqucspkg.sh/download [3] https://sourceforge.net/p/qucs/discussion/311050/thread/a11165c7/ [4] https://sourceforge.net/p/qucs/bugs/ 
From: Guilherme Brondani Torri <guitorri@gm...>  20140614 23:31:19

On 6/13/14, 6:09 PM, Nick Paulin wrote: > Hi, > > I'm trying to generate an inverse fourier transform on a filter response > that will give me the same results described in Agilent's application notes > 12878 and 128710 on Advanced Filter Tuning techniques. Is there a ready > made function in QUCS that can generate these S11 and S22 time domain > transforms? Or does anyone know if a QUCS based example is available that > does this? > Hello, Isn't it called TDR (time domain reflectometry) ? I am not aware of such a feature available directly in Qucs. Perhaps it is possible to postprocess the results to plot what you want. These are not in related to Qucs but look interesting: [1], [2]. There are some data analysis functions [3](page 16,17) that you could use in equations on the schemati. But I am not sure they will suffice for such calculations. This topic is interesting. Please let us know if you find a way to implement it. If more functions are required we could add it to Qucs. ;) Regards, Guilherme [1] http://nbviewer.ipython.org/github/scikitrf/examples/blob/master/Time%20Domain.ipynb [2] http://www.lightwaveonline.com/articles/print/volume19/issue9/departments/modelingsignalintegrityinelectroopticalsystems53448662.html [3] http://qucs.sourceforge.net/docs/tutorial/functions.pdf 
From: Nick Paulin <npaulin@gm...>  20140613 16:09:37

Hi, I'm trying to generate an inverse fourier transform on a filter response that will give me the same results described in Agilent's application notes 12878 and 128710 on Advanced Filter Tuning techniques. Is there a ready made function in QUCS that can generate these S11 and S22 time domain transforms? Or does anyone know if a QUCS based example is available that does this?  Nick Paulin 
From: Guilherme Brondani Torri <guitorri@gm...>  20140610 12:13:47

Hi Neil, Good to know it is working. In fact, the max(x,[,range]) is only documented on the Help, not on our manuals/tutorials: http://qucs.sourceforge.net/docs.html http://qucs.sourceforge.net/docs/tutorial/functions.pdf I also had some issues with positive and negative cost functions. I never looked in detail to check what was the reason. I some cases changing the sign worked for me. I any case, ASCO is the optimizer, you can find the manual over here: http://asco.sourceforge.net/manual.html Regards, Guilherme On 6/10/14, 11:03 AM, Neil Thomas wrote: > Hi Guilherme, > > I hadn't seen that example before. But then I was starting from Studio > 2.1.0, which has a very thin help section. It optimises a DC resistor > value with no frequency dependence, hence my not knowing how to > specify frequency. I've switched to Qucs 0.0.17, I'm not sure whether > that's an important part of the solution, and I'm not going to switch > back and find out. Also in help, 0.0.17 documents the max(x,range) > function, which 2.1.0 doesn't. I'm not sure what the Studio project > was trying to acheive, but leaving out useful examples and > documentation is not an improvement. > > 'Making Qucs aware of frequency' is what the fmin:fmax range does in > the max() function when used like this >> passband = max(dB(S[2,1]), > fmin:fmax). > > I'm now getting an optimisation to run. I've had 'can't have negative > cost' errors when trying to maximise the passband, but asking it to be > equal to 1 seems to work OK and expresses much the same goal. I'll > play with refining the expression of goals later, but at least the > syntax is now working. > > thanks for your help. > > regards > Neil > > On 09/06/2014 18:05, Guilherme Brondani Torri wrote: >> On 6/9/14, 4:24 PM, Neil Thomas wrote: >>> Hi, >>> >>> I am just getting started with Qucs, using QucsStudio 2.1.0. My first >>> toy circuit simulation of a parallel inductor and capacitor fed by a >>> resistor from a source works just fine. The AC sweep shows the expected >>> resonance. I have named my output node 'output', and am plotting >>> output.v. Now I wish to try out the optimiser, to change the inductor >>> value to move the peak to a specific frequency. >>> >>> I think I need to write an equation to extract the gain at the target >>> frequency, which I can then maximise. My AC frequency sweep goes 10MHz >>> to 1GHz with 90 points per decade, or 181 elements. I have not yet >>> found >>> how to write a legal equation of the form 'X=gain_at_f_target'. Having >>> read read the 'mathematical functions' part of the documentation, >>> how to >>> access vectors, I tried X=output.v[100]. It complains that there is no >>> function. X=output.v[500e6] gives the same error. X=yvalue(output.v, >>> 500e6) looked as if it would do the trick, but is only allowed on >>> diagrams. X=dBm(output.v[100]) also says there's no function there. >>> >>> I have searched the documentation, and spent a day with google and >>> various combinations of 'optimiser qucs equation function frequency' to >>> no avail. I did look at the examples page, but the .sch seem to be the >>> wrong format, there didn't seem to be any optimisation ones available >>> either. >>> >>> I'm sure it's just simple syntax I'm missing, perhaps so obvious that >>> I've missed it. >>> >>> How do I make the optimiser aware of frequencies in the simulation? >>> >>> Or should I be driving the optimiser in a different way? >>> >>> Thanks for your help. >>> >>> Neil >>> >>> >> Hi Neil, >> >> Have you seen the examples on the Getting Started from the Help menu? >> There is one about "Getting Started with Optimization". Also >> accessible in [1]. >> >> I haven't tried slicing an array, but perhaps using the max / min and >> the frequency range would be more robust. >> >> The optimizer takes cost functions (constraints) which it tries to >> optimize for. >> >> What do you mean by "make the optimizer aware of frequencies"? >> >> I hope it helps. >> >> Regards, >> Guilherme >> >> [1] >> http://www.gnudarwin.org/www001/src/ports/cad/qucs/work/qucs0.0.12/qucshelp/docs/en/start_opt.html >> > 
From: Guilherme Brondani Torri <guitorri@gm...>  20140609 17:05:24

On 6/9/14, 4:24 PM, Neil Thomas wrote: > Hi, > > I am just getting started with Qucs, using QucsStudio 2.1.0. My first > toy circuit simulation of a parallel inductor and capacitor fed by a > resistor from a source works just fine. The AC sweep shows the expected > resonance. I have named my output node 'output', and am plotting > output.v. Now I wish to try out the optimiser, to change the inductor > value to move the peak to a specific frequency. > > I think I need to write an equation to extract the gain at the target > frequency, which I can then maximise. My AC frequency sweep goes 10MHz > to 1GHz with 90 points per decade, or 181 elements. I have not yet found > how to write a legal equation of the form 'X=gain_at_f_target'. Having > read read the 'mathematical functions' part of the documentation, how to > access vectors, I tried X=output.v[100]. It complains that there is no > function. X=output.v[500e6] gives the same error. X=yvalue(output.v, > 500e6) looked as if it would do the trick, but is only allowed on > diagrams. X=dBm(output.v[100]) also says there's no function there. > > I have searched the documentation, and spent a day with google and > various combinations of 'optimiser qucs equation function frequency' to > no avail. I did look at the examples page, but the .sch seem to be the > wrong format, there didn't seem to be any optimisation ones available > either. > > I'm sure it's just simple syntax I'm missing, perhaps so obvious that > I've missed it. > > How do I make the optimiser aware of frequencies in the simulation? > > Or should I be driving the optimiser in a different way? > > Thanks for your help. > > Neil > > Hi Neil, Have you seen the examples on the Getting Started from the Help menu? There is one about "Getting Started with Optimization". Also accessible in [1]. I haven't tried slicing an array, but perhaps using the max / min and the frequency range would be more robust. The optimizer takes cost functions (constraints) which it tries to optimize for. What do you mean by "make the optimizer aware of frequencies"? I hope it helps. Regards, Guilherme [1] http://www.gnudarwin.org/www001/src/ports/cad/qucs/work/qucs0.0.12/qucshelp/docs/en/start_opt.html 
From: Neil Thomas <neil@sm...>  20140609 14:24:43

Hi, I am just getting started with Qucs, using QucsStudio 2.1.0. My first toy circuit simulation of a parallel inductor and capacitor fed by a resistor from a source works just fine. The AC sweep shows the expected resonance. I have named my output node 'output', and am plotting output.v. Now I wish to try out the optimiser, to change the inductor value to move the peak to a specific frequency. I think I need to write an equation to extract the gain at the target frequency, which I can then maximise. My AC frequency sweep goes 10MHz to 1GHz with 90 points per decade, or 181 elements. I have not yet found how to write a legal equation of the form 'X=gain_at_f_target'. Having read read the 'mathematical functions' part of the documentation, how to access vectors, I tried X=output.v[100]. It complains that there is no function. X=output.v[500e6] gives the same error. X=yvalue(output.v, 500e6) looked as if it would do the trick, but is only allowed on diagrams. X=dBm(output.v[100]) also says there's no function there. I have searched the documentation, and spent a day with google and various combinations of 'optimiser qucs equation function frequency' to no avail. I did look at the examples page, but the .sch seem to be the wrong format, there didn't seem to be any optimisation ones available either. I'm sure it's just simple syntax I'm missing, perhaps so obvious that I've missed it. How do I make the optimiser aware of frequencies in the simulation? Or should I be driving the optimiser in a different way? Thanks for your help. Neil 
From: Guilherme Brondani Torri <guitorri@gm...>  20140604 19:26:53

On 6/4/14, 12:51 PM, denis rakar wrote: > hi, > > I am a student of electrical engineering in Croatia. and have to simulate > an DCAC converter for an project. we usually use a Simplorer 7 student > version, but there I can't simulate more then 15 elements. So i has found > your software QUCS version 0.0.15. but I can't simulate an ordinary dcdc > converter, i think because it hasn't an PMW modulator. I tried use an > rectangle voltage source, but it doesn't work. Please can You help me? > > Best Regards. > > Denis Rakar, > Student of electrical engineering, at the Technical University of Rijeka, > Croatia >  > Learn Graph Databases  Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and their > applications. Written by three acclaimed leaders in the field, > this first edition is now available. Download your free book today! > http://p.sf.net/sfu/NeoTech > _______________________________________________ > Qucshelp mailing list > Qucshelp@... > https://lists.sourceforge.net/lists/listinfo/qucshelp Hello, As others already mentioned, there are several ways one can generate a PWM. Can you share the schematic that is causing you trouble? In any case, there are a few examples of dcdc converters in http://qucs.sourceforge.net/examples.html Regards, Guilherme 
From: Andy Fierman <andyfierman@si...>  20140604 12:11:10

Denis, You may need to take a little time to get out of the "Simplorer way" of doing simulations and try to think at a lower level. Simplorer gives you ready made blocks to do things but QUCS (in the same way as spice simulators) gives you basic components and equationdefined devices or EDD a.k.a. (behavioural, arbitrary or dependent sources in spice) from which you can build more complex functional blocks. You do not need to build a PWM block out of transistors in QUCS: you can do it using something like a Voltage Pulse Source set to generate a sawtooth or a triangle wave and then use an EDD to define a comparator function with a bounded output swing (I'm not too familiar with the QUCS EDD but in spice it would be something like Vout=0.5*Vswing*(tanh((V(in1)V(in2)*Avol)+1) where Vswing is the 0V to max output voltage swing and Avol is a notional open loop gain, usually around 1k is OK here). You'll find these bits here: Components > sources > Voltage Pulse Source Components > nonlinear components > Equation Defined Device There are of course many more parts under the Components tab ... :) For info on EDD see: "Introduction to equation deﬁned devices (EDD)" starting p24 in: http://qucs.sourceforge.net/docs/tutorial/equations.pdf Although I probably shouldn't say it here you might also like to look at: Scilab and the Xcos toolbox: http://www.scilab.org/content/download/1107/10095/file/Xcos_beginners.pdf and: Scicos: http://www.scicos.org/ Cheers, Andy. signality.co.uk On 4 June 2014 12:09, Frans Schreuder <fransschreuder@...> wrote: > Dear Denis Rakar, > > We can surely help you, but I don't know how  your question is missing > some essential information. > you should be able to use a rectangle voltage source, but you say it > doesn't work. Can you say what doesn't work? > > Frans > > On 06/04/2014 12:51 PM, denis rakar wrote: > > hi, > > > > I am a student of electrical engineering in Croatia. and have to simulate > > an DCAC converter for an project. we usually use a Simplorer 7 student > > version, but there I can't simulate more then 15 elements. So i has found > > your software QUCS version 0.0.15. but I can't simulate an ordinary dcdc > > converter, i think because it hasn't an PMW modulator. I tried use an > > rectangle voltage source, but it doesn't work. Please can You help me? > > > > Best Regards. > > > > Denis Rakar, > > Student of electrical engineering, at the Technical University of Rijeka, > > Croatia > > >  > > Learn Graph Databases  Download FREE O'Reilly Book > > "Graph Databases" is the definitive new guide to graph databases and > their > > applications. Written by three acclaimed leaders in the field, > > this first edition is now available. Download your free book today! > > http://p.sf.net/sfu/NeoTech > > _______________________________________________ > > Qucshelp mailing list > > Qucshelp@... > > https://lists.sourceforge.net/lists/listinfo/qucshelp > > > >  > Learn Graph Databases  Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and their > applications. Written by three acclaimed leaders in the field, > this first edition is now available. Download your free book today! > http://p.sf.net/sfu/NeoTech > _______________________________________________ > Qucshelp mailing list > Qucshelp@... > https://lists.sourceforge.net/lists/listinfo/qucshelp > 
From: Frans Schreuder <fransschreuder@gm...>  20140604 11:11:05

Dear Denis Rakar, We can surely help you, but I don't know how  your question is missing some essential information. you should be able to use a rectangle voltage source, but you say it doesn't work. Can you say what doesn't work? Frans On 06/04/2014 12:51 PM, denis rakar wrote: > hi, > > I am a student of electrical engineering in Croatia. and have to simulate > an DCAC converter for an project. we usually use a Simplorer 7 student > version, but there I can't simulate more then 15 elements. So i has found > your software QUCS version 0.0.15. but I can't simulate an ordinary dcdc > converter, i think because it hasn't an PMW modulator. I tried use an > rectangle voltage source, but it doesn't work. Please can You help me? > > Best Regards. > > Denis Rakar, > Student of electrical engineering, at the Technical University of Rijeka, > Croatia >  > Learn Graph Databases  Download FREE O'Reilly Book > "Graph Databases" is the definitive new guide to graph databases and their > applications. Written by three acclaimed leaders in the field, > this first edition is now available. Download your free book today! > http://p.sf.net/sfu/NeoTech > _______________________________________________ > Qucshelp mailing list > Qucshelp@... > https://lists.sourceforge.net/lists/listinfo/qucshelp 
From: denis rakar <rakar052@gm...>  20140604 10:51:44

hi, I am a student of electrical engineering in Croatia. and have to simulate an DCAC converter for an project. we usually use a Simplorer 7 student version, but there I can't simulate more then 15 elements. So i has found your software QUCS version 0.0.15. but I can't simulate an ordinary dcdc converter, i think because it hasn't an PMW modulator. I tried use an rectangle voltage source, but it doesn't work. Please can You help me? Best Regards. Denis Rakar, Student of electrical engineering, at the Technical University of Rijeka, Croatia 