Difference between revisions of "Ngspice/C2/DC-Sweep-Analysis/English-timed"
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| − | | Now I go to the | + | | Now I go to the folder where the '''netlist''' file, "example.cir", is saved. |
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| 02:26 | | 02:26 | ||
| − | | '''cd downloads path to the folder | + | | '''cd downloads''' path to the folder and press '''Enter.''' |
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| 02:33 | | 02:33 | ||
| − | | | + | | Now, let us '''simulate''' the '''ngspice''' file. |
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| 02:39 | | 02:39 | ||
| − | | On | + | | On terminal, |
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| 02:40 | | 02:40 | ||
| − | | Type '''ngspice '''space''' example.cir''' and press '''Enter.''' | + | | Type: '''ngspice '''space''' example.cir''' and press '''Enter.''' |
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| 02:51 | | 02:51 | ||
| − | | Value of | + | | Value of voltage v1 is 24 volts. |
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| 02:56 | | 02:56 | ||
| − | | Value of | + | | Value of voltage v2 is 9.746 volts. |
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| 03:01 | | 03:01 | ||
| − | | Other | + | | Other node voltages are also displayed. |
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| 03:05 | | 03:05 | ||
| − | | | + | | Next we will see how to do '''nested dc sweep analysis.''' |
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| 03:24 | | 03:24 | ||
| − | | where | + | | where |
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| 03:26 | | 03:26 | ||
| − | | '''SRCNAM''' is the primary '''sweep | + | | '''SRCNAM''' is the primary '''sweep''' variable and '''SRC2''' is the secondary '''sweep''' variable. |
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| 03:33 | | 03:33 | ||
| − | | Secondary '''sweep | + | | Secondary '''sweep variable''' forms the outer loop. |
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| 03:36 | | 03:36 | ||
| − | | That is for every increment of secondary '''sweep variable,''' the first '''sweep variable''' is stepped through its entire range of values. | + | | That is, for every increment of secondary '''sweep variable,''' the first '''sweep variable''' is stepped through its entire range of values. |
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| 03:45 | | 03:45 | ||
| − | | It will be more clear with the example | + | | It will be more clear with the example circuit we will '''simulate.''' |
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| 03:50 | | 03:50 | ||
| − | | We will use '''Bipolar junction transistor '''based | + | | We will use '''Bipolar junction transistor '''based circuit in '''common base''' configuration. |
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Revision as of 20:44, 24 January 2016
Title of the Script: DC sweep analysis in ngspice
Author: Abhishek
Keywords: video tutorial, ngspice.
| Time | Narration |
|---|---|
| 00:01 | Welcome to this spoken tutorial on “DC sweep analysis in Ngspice”. |
| 00:07 | In this tutorial, we will learn: |
| 00:09 | * To perform DC sweep analysis and Nested DC sweep analysis. |
| 00:14 | Basic knowledge of electronic circuits is a prerequisite for this tutorial. |
| 00:19 | Basic knowledge of Ubuntu Linux and shell commands is also required. |
| 00:25 | Ubuntu 12.04 is the operating system used with ngspice version 23 installed. |
| 00:33 | We will use the example circuit shown. |
| 00:36 | The circuit consists of three prominent nodes- “1”, “2” and “3”. |
| 00:40 | In addition, a fourth node called as reference OR datum node must be marked as node “0”. |
| 00:47 | This is mandatory for any circuit. |
| 00:51 | Let us open the ngspice netlist file "example.cir" corresponding to the circuit schematic shown before, in the text editor. |
| 01:00 | I have already opened this file in gedit text editor. |
| 01:04 | Note that netlist file is saved with ".cir" extension. |
| 01:10 | We can see all the components like voltage source, resistors and information about nodes connecting them together. |
| 01:18 | 'dc' command included in the netlist file is used to perform dc sweep analysis. |
| 01:25 | General form to use 'dc' command is as shown: |
| 01:29 | dot DC SRCNAM VSTART VSTOP VINCR |
| 01:35 | where |
| 01:37 | SRCNAM is name of independent voltage and current source. |
| 01:42 | VSTART, VSTOP and VINCR are the starting, final and increment values respectively, for the source. |
| 01:51 | As you see, we are sweeping voltage source V1 for a single value of 24 VOLTS with the step increment of 1. |
| 02:02 | Now, we will simulate this circuit and find out voltage values at different nodes. |
| 02:08 | Let us open ngspice through terminal. |
| 02:11 | Press Control, Alt, T together. |
| 02:14 | This will open the Terminal window. |
| 02:18 | Now I go to the folder where the netlist file, "example.cir", is saved. |
| 02:23 | I do this as follows: |
| 02:26 | cd downloads path to the folder and press Enter. |
| 02:33 | Now, let us simulate the ngspice file. |
| 02:36 | Let us see how this can be done. |
| 02:39 | On terminal, |
| 02:40 | Type: ngspice space example.cir and press Enter. |
| 02:51 | Value of voltage v1 is 24 volts. |
| 02:56 | Value of voltage v2 is 9.746 volts. |
| 03:01 | Other node voltages are also displayed. |
| 03:05 | Next we will see how to do nested dc sweep analysis. |
| 03:10 | Generalized form for this is as shown. |
| 03:14 | Dot DC SRCNAM VSTART VSTOP VINCR SRC2 START2 STOP2 INCR2 |
| 03:24 | where |
| 03:26 | SRCNAM is the primary sweep variable and SRC2 is the secondary sweep variable. |
| 03:33 | Secondary sweep variable forms the outer loop. |
| 03:36 | That is, for every increment of secondary sweep variable, the first sweep variable is stepped through its entire range of values. |
| 03:45 | It will be more clear with the example circuit we will simulate. |
| 03:50 | We will use Bipolar junction transistor based circuit in common base configuration. |
| 03:56 | Primary sweep variable is voltage Vin connected between emitter and base terminals. |
| 04:03 | Secondary sweep variable will be the load resistor Rload. |
| 04:08 | We will plot output voltage versus input voltage for different values of the load resistor. |
| 04:14 | The output voltage is the voltage across Rload and the input voltage is Vin |
| 04:21 | Following is the netlist corresponding to the common base transistor circuit. |
| 04:26 | NPN is the default model used for transistor, mod1, in the circuit. |
| 04:33 | As you can see Vin is varied from 0.2 volts to 2 volts with step increment of 0.02 volts. |
| 04:45 | Rload is varied from 5kiloohms to 10 kiloohms with step increment of 2kiloohms |
| 04:53 | For different values of Rload, Vin is swept through the complete range of 0.2 to 2. |
| 04:59 | Graphs of output voltage versus input voltage is plotted in each case. |
| 05:05 | Plot v of 3,4 plots the voltage drop between the nodes 3 and 4, that is the voltage across Rload. |
| 05:15 | Now we will simulate this circuit and see the results. |
| 05:19 | On the terminal type source space example nested.cir and press Enter. |
| 05:35 | This will run the simulation. |
| 05:37 | source command is used to simulate the netlist from within the ngspice simulator environment |
| 05:44 | As you can see graph of output voltage versus input voltage is plotted for different values of load resistor. |
| 05:52 | Quit the ngspice simulator by typing quit and press enter. |
| 05:59 | Here we come to the end of this tutorial |
| 06:02 | In this tutorial we learnt, |
| 06:04 | To perform, |
| 06:05 | DC sweep analysis of a given circuit. |
| 06:08 | Nested DC sweep analysis of a given circuit. |
| 06:12 | Watch the video available at the following link |
| 06:14 | It summarizes the Spoken Tutorial project |
| 06:18 | If you do not have good bandwidth, you can download and watch it |
| 06:22 | The Spoken Tutorial Project Team |
| 06:24 | Conducts workshops using spoken tutorials |
| 06:27 | Gives certificates for those who pass an online test |
| 06:31 | For more details, please write to contact at spoken hyphen tutorial dot org |
| 06:37 | Spoken Tutorial is a part of the Talk to a Teacher project |
| 06:41 | It is supported by the National Mission on Education through ICT, MHRD, Government of India |
| 06:47 | More information on this Mission is available at |
| 06:51 | spoken hyphen tutorial dot org slash NMEICT hyphen Intro |
| 06:58 | Thank you for joining. |
| 06:59 | Hope you found this tutorial useful. |
| 07:02 | This is Anuradha Amrutkar signing off. |
