Difference between revisions of "Ngspice/C2/DC-Sweep-Analysis/English-timed"
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| 03:26 | | 03:26 | ||
− | | '''SRCNAM''' is the | + | | '''SRCNAM''' is the '''Primary sweep variable''' and '''SRC2''' is the '''Secondary sweep variable'''. |
|- | |- | ||
| 03:33 | | 03:33 | ||
− | | | + | | '''Secondary sweep variable''' forms the outer loop. |
|- | |- | ||
| 03:36 | | 03:36 | ||
− | | That is, for every increment of | + | | 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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| 03:56 | | 03:56 | ||
− | | | + | | '''Primary sweep variable''' is voltage '''Vin''', connected between '''emitter''' and '''base''' terminals. |
|- | |- | ||
| 04:03 | | 04:03 | ||
− | | | + | | '''Secondary sweep variable''' will be the '''load resistor''' ''''Rload'.''' |
|- | |- | ||
| 04:08 | | 04:08 | ||
− | | We will '''plot''' '''output voltage '''versus '''input voltage '''for different values of the '''load resistor'''. | + | | We will '''plot''' '''output voltage''' versus '''input voltage''', for different values of the '''load resistor'''. |
|- | |- | ||
| 04:14 | | 04:14 | ||
− | | The output voltage is the voltage across Rload and the input voltage is | + | | The output voltage is the voltage across 'Rload' and the input voltage is 'Vin'. |
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| 04:26 | | 04:26 | ||
− | | | + | | "NPN" is the default model used for transistor "mod1", in the circuit. |
|- | |- | ||
| 04:33 | | 04:33 | ||
− | | As you can see Vin is varied from 0.2 | + | | As you can see, 'Vin' is varied from 0.2 volts to 2 volts with step increment of 0.02 volts. |
|- | |- | ||
| 04:45 | | 04:45 | ||
− | | | + | | 'Rload' is varied from 5 '''kilo-ohms''' to 10 '''kilo-ohms''' with step increment of '''2 kilo-ohms'''. |
|- | |- | ||
| 04:53 | | 04:53 | ||
− | | For different values of ''' | + | | For different values of 'Rload', 'Vin' is swept through the complete range of 0.2 to 2. |
|- | |- | ||
| 04:59 | | 04:59 | ||
− | | Graphs of | + | | Graphs of output-voltage versus input-voltage is plotted in each case. |
|- | |- | ||
| 05:05 | | 05:05 | ||
− | | '''Plot v of 3 | + | | '''Plot v of 3 comma 4''' plots the '''voltage drop''' between the nodes 3 and 4, that is the voltage across 'Rload'. |
|- | |- | ||
| 05:15 | | 05:15 | ||
− | | | + | | Now, we will '''simulate''' this circuit and see the results. |
|- | |- | ||
| 05:19 | | 05:19 | ||
− | | On the | + | | On the terminal, type: '''source space example nested.cir '''and press '''Enter.''' |
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| 05:37 | | 05:37 | ||
− | | '''source | + | | '''source command''' is used to '''simulate''' the '''netlist''' from within the '''ngspice''' '''simulator''' '''environment'''. |
|- | |- | ||
| 05:44 | | 05:44 | ||
− | | As you can see graph of | + | | As you can see, graph of output-voltage versus input-voltage is plotted for different values of '''load resistor.''' |
|- | |- | ||
| 05:52 | | 05:52 | ||
− | | Quit the '''ngspice | + | | Quit the '''ngspice simulator''' by typing "quit" and press '''Enter.''' |
|- | |- | ||
| 05:59 | | 05:59 | ||
− | | Here we come to the end of this | + | | Here, we come to the end of this tutorial. |
|- | |- | ||
| 06:02 | | 06:02 | ||
− | | | + | | In this tutorial, we learnt: |
|- | |- | ||
| 06:04 | | 06:04 | ||
− | | To perform | + | | To perform- |
|- | |- | ||
| 06:05 | | 06:05 | ||
− | | DC sweep analysis of a given circuit. | + | |* DC sweep analysis of a given circuit. |
|- | |- | ||
| 06:08 | | 06:08 | ||
− | | Nested DC sweep analysis of a given circuit. | + | |* Nested DC sweep analysis of a given circuit. |
|- | |- | ||
| 06:12 | | 06:12 | ||
− | | Watch the video available at the following link | + | | Watch the video available at the following link. |
|- | |- | ||
| 06:14 | | 06:14 | ||
− | | | + | | It summarizes the '''Spoken Tutorial''' project. |
|- | |- | ||
| 06:18 | | 06:18 | ||
− | | If you do not have good bandwidth, you can download and watch it | + | | If you do not have good bandwidth, you can download and watch it. |
|- | |- | ||
| 06:22 | | 06:22 | ||
− | | | + | | The Spoken Tutorial project team: |
|- | |- | ||
| 06:24 | | 06:24 | ||
− | | Conducts workshops using spoken tutorials | + | |* Conducts workshops using spoken tutorials. |
|- | |- | ||
| 06:27 | | 06:27 | ||
− | | Gives certificates for those who pass an online test | + | |* Gives certificates for those who pass an online test. |
|- | |- | ||
| 06:31 | | 06:31 | ||
− | | For more details, please write to contact at spoken hyphen tutorial dot org | + | | For more details, please write to: |
+ | '''contact at spoken hyphen tutorial dot org''' | ||
|- | |- | ||
| 06:37 | | 06:37 | ||
− | | Spoken Tutorial is a part of the Talk to a Teacher project | + | | '''Spoken Tutorial''' is a part of the '''Talk to a Teacher''' project. |
|- | |- | ||
| 06:41 | | 06:41 | ||
− | | It is supported by the National Mission on Education through ICT, MHRD, Government of India | + | | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
|- | |- | ||
| 06:47 | | 06:47 | ||
− | | More information on this | + | | More information on this mission is available at: |
|- | |- | ||
| 06:51 | | 06:51 | ||
− | | spoken hyphen tutorial dot org slash NMEICT hyphen Intro | + | | '''spoken hyphen tutorial dot org slash NMEICT hyphen Intro''' |
|- | |- | ||
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|- | |- | ||
| 07:02 | | 07:02 | ||
− | | This is Anuradha Amrutkar signing off. | + | | This is Anuradha Amrutkar, signing off. |
|} | |} |
Revision as of 21:40, 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 5 kilo-ohms to 10 kilo-ohms with step increment of 2 kilo-ohms. |
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 comma 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. |