Difference between revisions of "Ngspice/C2/DC-Sweep-Analysis/English-timed"
From Script | Spoken-Tutorial
(Created page with "'''Title of the Script:''' DC sweep analysis in ngspice '''Author:''' '''Abhishek''' '''Keywords: '''video tutorial,''' '''ngspice. {| border=1 !Time !Narration |- |...") |
|||
| Line 57: | Line 57: | ||
| 01:00 | | 01:00 | ||
| I have already opened this file in '''gedit text editor'''. | | I have already opened this file in '''gedit text editor'''. | ||
| − | |||
|- | |- | ||
| Line 82: | Line 81: | ||
| 01:35 | | 01:35 | ||
| where, | | where, | ||
| − | |||
|- | |- | ||
| Line 95: | Line 93: | ||
| 01:51 | | 01:51 | ||
| As you see we are sweeping '''voltage''' '''source''' V1 for a single value of 24 '''VOLTS''' with the step increment of 1. | | As you see we are sweeping '''voltage''' '''source''' V1 for a single value of 24 '''VOLTS''' with the step increment of 1. | ||
| − | |||
|- | |- | ||
| Line 161: | Line 158: | ||
| 03:10 | | 03:10 | ||
| Generalized form for this is as shown. | | Generalized form for this is as shown. | ||
| − | |||
|- | |- | ||
| Line 170: | Line 166: | ||
| 03:24 | | 03:24 | ||
| where, | | where, | ||
| − | |||
|- | |- | ||
| Line 247: | Line 242: | ||
| 05:35 | | 05:35 | ||
| This will '''run''' the '''simulation.''' | | This will '''run''' the '''simulation.''' | ||
| − | |||
|- | |- | ||
| Line 296: | Line 290: | ||
| 06:22 | | 06:22 | ||
| The Spoken Tutorial Project Team | | The Spoken Tutorial Project Team | ||
| − | |||
| − | |||
|- | |- | ||
Revision as of 10:49, 4 September 2014
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. |
