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Is there a way to plot currents in Ngspice?
In ngspice (which is based on Berkeley Spice 3) you can only plot currents through (independent) voltage sources. These are the only currents that appear in the circuit equations SPICE works from.
Where do I find the voltage source in Ngspice?
The voltage source is connected between 0 (ground) and node ‘in’, value 1, R1 between ‘in’ and ‘out’ with value 1k, R2 between ‘out’ and ground and value 2k. Line 1 is a title line. .end in line 5 denotes the end of the netlist. Put these lines into a text file named vdiv.cir and save it to the folder C:\\Spice64\\bin (If you are with MS Windows).
What do you need to know about tclspice Ngspice?
What is TCLspice ? ngspice is a circuit simulator that numerically solves equations describing (electronic) circuits: These are made of passive and active devices. Time varying currents and voltages are simulated as well as noise and small signal behavior. ngspice is the Open Source successor of the venerable spice3f5 from UC at Berkeley.
How to start a simulation in ngspice.exe?
Now start ngspice by double click onto ngspice.exe in C:\\Spice64\\bin. Load the netlist into ngspice by entering the command source vdiv.cir . ngspice is now ready for simulation, the netlist is loaded. What kind of simulation do we now want to have?
Where can I download a zip file for Ngspice?
Download the zip file for ngspice-32 (about 8.7 MB). Expand this zip file into directory C:\\. In MS Windows 10 you might need admin rights to do so. Thus you will get C:\\Spice64 with several sub-directories.
What do you need to know about Ngspice?
As shown in Fig. 1, you start with a circuit (here: an inverter). You have to create a netlist describing this circuit. The netlist is the input to ngspice, telling it about the circuit to be simulated. Together with some simulation commands this input cares for reading and parsing the netlist, starting the simulation and plotting the output.
Where can I find the user manual for Ngspice?
For a quick introduction to ngspice, you can visit their website, or you can proceed to the download page. You can access the user manual here. Once you have ngspice installed, you can run it interactively, or in batch mode. Let’s plot the transistor characteristics in the interactive mode.
What are the advantages of using Ngspice in interactive mode?
One advantage of running ngspice in interactive mode is it allows us to run simulations via the ngspice prompt without reloading the circuit. For example, if we want to plot the transfer characteristics instead of the output characteristics, we can just run the command: This sweeps the gate voltage source, vg, from 0V to 1V, in steps of 0.1V.
Where can I find the BSIM4 parameters in Ngspice?
A complete list of accessible BSIM4 parameters are listed on page 608 of the ngspice user manual. Calculations can also be done on the parameters: You can also simulate the effect of varying device parameters by using more complex control constructs like loops:
What is voltage source V1 in Ngspice?
We have to talk about the voltage source V1. In the previous example it just emits a constant 1V. Now it is more complex.
How to start Ngspice with vdiv.cir file?
Put these lines into a text file named vdiv.cir and save it to the folder C:\\Spice64\\bin (If you are with MS Windows). Now start ngspice by double click onto ngspice.exe in C:\\Spice64\\bin. Load the netlist into ngspice by entering the command source vdiv.cir . ngspice is now ready for simulation, the netlist is loaded.