ESim/C3/Uploading-a-spice-Subcircuit-file/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to the spoken tutorial on Uploading a spice Subcircuit file in eSim. |
| 00:08 | In this tutorial, using eSim we will learn to upload an external spice subcircuit file in eSim. |
| 00:17 | To record this tutorial, we will use-
Ubuntu Linux OS version 16.04 eSim version 2.0 |
| 00:29 | To practice this tutorial, you should know how to create and simulate a circuit and subcircuit in eSim. |
| 00:38 | If not, watch the prerequisite eSim tutorials on this website. |
| 00:44 | The subcircuit file always begins with the dot subckt statement. |
| 00:50 | Subname is the subcircuit component name. |
| 00:55 | N1, N2 are the nodes. The subcircuit ends with dot Ends followed by the subcircuit name. |
| 01:05 | This option is available in the eSim 2 point 0 and later versions. |
| 01:12 | The subcircuit file is added to the eSim subcircuit library. |
| 01:18 | You can also refer to the subcircuit files available in the Ngspice manual. |
| 01:25 | To launch eSim, you need to double-click on the eSim icon on your Desktop. |
| 01:31 | I have already opened eSim. |
| 01:35 | On the eSim main window, click on the Subcircuit button from the left toolbar. |
| 01:41 | In the previous tutorial, we have seen how to create a new subcircuit and edit an existing subcircuit. |
| 01:51 | Pause the video here. Download Fulladder_using_Nand text file from the Code file section available on this page. |
| 02:01 | Save it on Desktop with a dot sub extension. |
| 02:06 | Now, on the Subcircuit tab, click on Upload a Subcircuit option. I have saved this file on my Desktop. |
| 02:16 | Double-click on the Desktop folder. |
| 02:19 | Click on Full_adder_using_Nand dot sub and then click on the Open button. |
| 02:27 | The subcircuit uploaded using Upload option loads only dot sub file. |
| 02:34 | As you can see here, only dot sub files will be available. |
| 02:39 | No sch or cir files will be present in this folder. |
| 02:45 | Let us simulate the Full Adder example with the newly added subcircuit library. |
| 02:52 | Open the FullAdder example from the Examples folder of eSim installer. |
| 02:59 | Click on the Open Project option from the top menu. |
| 03:04 | Locate the directory where the eSim is installed and double-click on the Examples folder. |
| 03:13 | Now select the FullAdder example and click on the Open button. |
| 03:20 | On the eSim window, select FullAdder under Projects. |
| 03:25 | Then click on Convert Kicad to Ngspice button from the left toolbar. |
| 03:31 | Let the transient analysis parameters and Source details be the same. |
| 03:37 | We will not change it. Skip the Ngspice Model and Device Modeling tab. |
| 03:44 | Under the Subcircuits tab, click the ADD button. |
| 03:49 | Click on FA using NAND dot sub file. |
| 03:54 | Now click on the Open button. On the Kicad to Ngspice tab, click on the Convert button. |
| 04:04 | On the eSim window, click on the Simulation button from the left toolbar. |
| 04:10 | An Ngspice terminal and plot windows open along with a Python plot window. |
| 04:17 | We have given the inputs as 5, 5 and 0. |
| 04:25 | Hence, the output for Sum is 0 volts and Carry is 5 volts. Close the Ngspice terminal and plot windows. |
| 04:36 | In the Python plot window, check the Sum node and Cout node. |
| 04:43 | And click on the Plot button. You can see the output of the sum and carry node. |
| 04:51 | Close the Python plot window. |
| 04:54 | The subcircuit file can also have model or subcircuit components within it. |
| 05:01 | These components can be from existing eSim libraries. |
| 05:06 | If the models or subcircuits are not present in eSim library then the user has to define the same. |
| 05:14 | For example: Let us open the UJT subcircuit file present in eSim. |
| 05:21 | In this file, there is a subcircuit of a Half adder and this is from eSim libraries. |
| 05:29 | Hence the statement, dot include is added in this file. |
| 05:35 | Here, the model RMOD and Emitter are the two models which are defined by the user. |
| 05:43 | These model files are not available under eSim libraries. |
| 05:48 | Hence, you need to mention the parameters in the spice model format. |
| 05:54 | If any subcircuit is used, then the parameters are defined in the spice subcircuit format. |
| 06:04 | Let us summarize.
In this tutorial, we learnt to upload an external spice subcircuit file in eSim |
| 06:11 | Do you have questions in this Spoken Tutorial? Please visit this site. |
| 06:17 | For any general or technical questions on eSim, visit the FOSSEE forum and post your question. |
| 06:25 | The FOSSEE team coordinates the Circuit Simulation project. |
| 06:30 | We give Certificates and Honorarium to the contributors. For more details, please visit this site. |
| 06:40 | The FOSSEE team coordinates the Lab Migration project. For more details, please visit this site. |
| 06:50 | Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India. |
| 06:57 | This is Gloria N from IIT Bombay signing off. Thank you |
