Re: Update gnucap gitbook
On Sun, Aug 23, 2020 at 8:39 AM Vladimir Zhbanov wrote: > > FWIW, I've added a link to your book here: > > https://github.com/lepton-eda/lepton-eda/wiki/Simulation > > Hopefully, some more people will find it :-) > Thank you Vladimir! That is helpful, interesting to learn on lepton-eda and to see the T flipflop example. How does lepton-eda support gnucap? I can add a link from the book back to https://github.com/lepton-eda/lepton-eda Thanks, Patrick
Update gnucap gitbook
Hello, I added some more notes on getting started with Gnucap in the gitbook: https://mulder-patrick.gitbook.io/gnucap/gnucap-getting-started This chapter just should walk you through a basic simulation cycle entering a netlist -> probes -> simulation -> processing output For plotting the output I am not yet sure what to suggest. The builtin plot command does not yet give a nice curve, the gwave installation would take some more time, the gnuplot simulation is best so far. (I mention the work on plugins that in the future it can simply be done with a plugin) Also, if you find the quality of the book good enough, it would be nice to have it linked from: http://gnucap.org/dokuwiki/doku.php/gnucap:manual:examples If you have ideas how to improve the quality of the basic examples also please let me know. Thanks a lot, nice weekend, Patrick
Verilog syntax (Was: parameter usage in simulation)
On Mon, Apr 20, 2020 at 9:05 AM al davis wrote: > > On Mon, 20 Apr 2020 08:43:55 +0200 > patrick wrote: > > module m(1,2); > >^ ? need 4 more nodes > > > ... > > Surely I am missing some things... anyway thanks for your help. > > > > > I think it's in spice mode .. expecting spice syntax. > In spice syntax, a line beginning with 'm' is a mosfet instance. > > Commands in spice mode begin with dot, so try ".verilog" to switch to > verilog mode. > > Thanks Al! Ok, I confirm it looks better with a .verilog at the start. Also had a quick look at the wiki now: http://gnucap.org/dokuwiki/doku.php/gnucap:manual:languages:verilog But trying to run a simple sweep on the Resistor gives: .verilog param w=2 module m(1,2); resistor #(.r(w*5)) r(1,2); endmodule m #(.w(w)) m1(0, 1); // sweep dc voltage vin 1 0 dc 3 .dc vin 0 5 0.2 default plugins: cmake-2 2017.10.18 param w=2 ^ ? p: no match m #(.w(w)) m1(0, 1); ^ ? m: 1); has no value? // sweep dc voltage ^ ? /: no match vin 1 0 dc 3
Re: parameter usage in simulatoin
On Sun, Apr 19, 2020 at 4:45 PM Felix Salfelder wrote: > > On Sun, Apr 19, 2020 at 04:16:17PM +0200, patrick wrote: > > I am trying to vary W/L parameters of a MOS transistor. > > Hi Patrick. > > Could you share the model or instanciation of that transistor? Hi Felix, thanks for the pointers. My goal is to get/refresh some basic understanding of simple circuits. As a start I take this inverter where I would like to sweep W/L parameters. Indeed W and L would be on the global scope (I think it's what works in other simulators - but not so important): .param wn=1 .param wp=2 .subckt inv inn outn vddn m2 outn inn vddn vddn pmos1 w=wp m1 outn inn 0 0 nmos1 w=wn .ends # supply voltage vdd inv_vdd1 0 DC 5 # inverter x1 inv_in out_n inv_vdd inv # load rds inv_vdd1 inv_vdd 1e-6 # inverter input vin inv_in 0 DC 3 .model nmos1 nmos .model pmos1 pmos .print dc v(out_n) .dc vin 0 5 0.2 Note: The "module" syntax is interesting because I also started to use/learn verilog. And a common syntax might be nice. However, the example of the resistor module gives: default plugins: cmake-2 2017.10.18 module m(1,2); ^ ? need 4 more nodes module m(1,2); ^ ? no match: area resistor #(.r(w*5)) r(1,2); ^ ? need ) resistor #(.r(w*5)) r(1,2); ^ ? what's this? resistor #(.r(w*5)) r(1,2); ^ ? what's this? resistor #(.r(w*5)) r(1,2); ^ ? what's this? endmodule ^ ? need 4 more nodes Surely I am missing some things... anyway thanks for your help.
parameter usage in simulatoin
Hello, I am trying to vary W/L parameters of a MOS transistor. With this syntax: .param L1=180e-9 .param W1=300e-9 I get: # simple sweep parameter L1 not specified, using default parameter W1 not specified, using default parameter L1 not specified, using default parameter W1 not specified, using default parameter L1 not specified, using default ... What is wrong? How can I get some more info on the error. Thanks! Patrick
Re: [Help-gnucap] gnucap jupyter demo
Hello, after Felix's work to connect Python and Gnucap (see details in his Fosdem talk: https://fosdem.org/2019/schedule/event/gnucap/ ) I've put together some small examples to run Jupyter notebooks (on Windows/Mac with help of Docker): https://github.com/mulderp/gnucap-jupyter * dockerfile: enables a user to run Jupyter and gnucap on all docker supported platforms (Win/Unix/Mac) * jupyter notebook: simple example of loading gnucap-python * spice circuit examples: work in progress, but basic example of DC sweep works, will play a bit more with that It would be nice to hear your feedback if any. Thanks! Patrick On Sat, Feb 2, 2019 at 5:10 PM Patrick Mulder wrote: > hello felix, > > now all jupyter stuff is one repo: > > https://github.com/mulderp/gnucap-jupyter > > > * dockerfile: enables a user to run Jupyter and gnucap on all docker > supported platforms (Win/Unix/Mac) > * jupyter notebook: simple example of loading gnucap-python > * spice circuit examples: work in progress, but basic example of DC sweep > works, will play a bit more with that > > > nice weekend, and FOSDEM, > > patrick > > PS feel free to announce this on the gnucap mailing list > > > ___ Help-gnucap mailing list Help-gnucap@gnu.org https://lists.gnu.org/mailman/listinfo/help-gnucap
[Help-gnucap] Plotting integration
Hi there, I tried to integrate plotting Gnucap simulation results with help of an Eclipse plugin. I got a basic DC simulation working: http://blog.farsinotare.com/media/images/gnucap_eclipse.png However, I am bit confused on the direction of currents in the Nmos transistor. they should be >0 mA not negative ? Vds 1 0 DC +10V Vgs 2 0 DC +3V M1 1 2 0 0 nmos_enhance L=10u W=400u * model statement (Level 1 by default) .MODEL nmos_enhance nmos (kp=20u Vto=+2 lambda=0) ** output requests ** .print DC V(1) I(Vds) ** analysis request ** .DC Vds 0V 10V 100mV Btw, my plan would be try to simulate some simple circuits first, before going again to Python/mixed signal simulation. BR, Patrick ___ Help-gnucap mailing list Help-gnucap@gnu.org https://lists.gnu.org/mailman/listinfo/help-gnucap
