From: Ray <coo...@gm...> - 2006-10-05 18:08:51
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---------- Forwarded message ---------- From: Ray <coo...@gm...> Date: Oct 4, 2006 8:13 PM Subject: How to simulate transmission line? To: quc...@qu... How to simulate a simple transmission line circuit? I want to see the waveform from a simple transmission line with matched and mismatched load. But the problem is my circuit doesn't work, the voltage is always zero. Can anyone share a transmission line schematic to me? Let me know how QUCS works on transmission line stuff. A few quick question 1, Why DC analysis only show the voltage, how to find the DC current? 2, I am using Ubuntu. However whenever I try to see the last netlist (F6), a pop-up saide cannot open text editor, how to remove this bug? I'm using Qucs 0.0.10. |
From: <Mic...@al...> - 2006-10-06 06:14:48
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Hello, > How to simulate a simple transmission line circuit? > > I want to see the waveform from a simple transmission line with > matched and mismatched load. But the problem is my circuit doesn't > work, the voltage is always zero. Can anyone share a transmission line > schematic to me? Let me know how QUCS works on transmission line > stuff. Please always send your schematic, so someone can correct it. It also answers all the questions that otherwise would arise. (E.g. what kind of simulation do you want ?) > A few quick question > > 1, Why DC analysis only show the voltage, how to find the DC current? Use the current probe from the "lumped component" section and place it where you like. > 2, I am using Ubuntu. However whenever I try to see the last netlist > (F6), a pop-up saide cannot open text editor, how to remove this bug? > > I'm using Qucs 0.0.10. I do not use Ubuntu, so I cannot say where the problem is, but you should be able to solve the problem: Go to the application settings (file menu) and enter the text editor you like best. This should work then. Regards, Michael |
From: Stefan J. <st...@gr...> - 2006-10-10 06:02:43
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Am Fr, 6.10.2006, 08:14, schrieb Mic...@al...: > Hello, Hello! >> How to simulate a simple transmission line circuit? >> >> I want to see the waveform from a simple transmission line with >> matched and mismatched load. But the problem is my circuit doesn't >> work, the voltage is always zero. Can anyone share a transmission line >> schematic to me? Let me know how QUCS works on transmission line >> stuff. > > Please always send your schematic, so someone can correct it. > It also answers all the questions that otherwise would arise. > (E.g. what kind of simulation do you want ?) I am very sorry about this. Michael forwarded me your schematic and I had to find that transient simulation of the transmission line is broken in the 0.0.10 version of qucs-core. It was working in the 0.0.9 version. Actually it was a bug hard to find in the transient solver occurring when the MNA matrix representation of a component changes during DC and TR. That is the case for the tline. I fixed this and sent a patch to apply to current cvs. The corrected version will be available soon on: http://www.lkcc.org/~raimi/tmp/qucs-sometimes/. Sorry, Stefan. |
From: Raimund 'R. J. <ra...@lk...> - 2006-10-10 07:57:14
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Stefan Jahn wrote: hi! > I am very sorry about this. Michael forwarded me your schematic and I had > to find that transient simulation of the transmission line is broken in > the 0.0.10 version of qucs-core. It was working in the 0.0.9 version. > Actually it was a bug hard to find in the transient solver occurring when > the MNA matrix representation of a component changes during DC and TR. > That is the case for the tline. I fixed this and sent a patch to apply > to current cvs. The corrected version will be available soon on: > http://www.lkcc.org/~raimi/tmp/qucs-sometimes/. it's there with md5sum 4ab3178e403cff8993fbc1b75286fbd2 Raimund -- ___ ___ _____________ / /| / /_ / ____/ ___/\ Nothing useful for / / / / _ / / __/ / __\/ more than a decade / /_/_/ \/ /_/_/ /_/ {www.|raimi@} /______/__/\._\.____/\.____/\ .org \._____\._\/\._\.___\/\.___\/ |