Add To Library Lt Spice

1. Ltspice Add Library
2. Add Spice Library To Ltspice

Syntax: .lib <filename>

To add an intrinsic component, a ‘.model’ file needs to be saved in the LTC LTspiceIV lib sub directory and for an extrinsic component, a ‘.subckt’ file needs to be added. Steps to include new device/ component models into an LT Spice schematic: METHOD 1: 1) Firstly, one needs to download the required device model having a.lib extension. An ICAP/4 product update. All current library files in the part database are shown in the list on the left of the New Model dialog. To save to a new library file, type a unique library name, then press the OK button. You can select an existing library file and keep on adding new models to the same library file.

This directive includes the model and subcircuit definitions of the named file as if that file had been typed into the netlist instead of the .lib command. Circuit elements at global scope are ignored.

An absolute path name may be entered for the filename. Otherwise LTspice looks first in the directory <LTspiceIV>libcmp and then <LTspiceIV>libsub and then in the directory that contains the calling netlist, where <LTspiceIV> is the directory containing the scad3.exe executable, typically installed as C:Program FilesLTCLTspiceIV.

No file name extension is assumed. You must use '.lib myfile.lib' not '.lib myfile' if the file is called 'myfile.lib'

It is possible to specify a URL of the following form as a file name:

.lib http://www.company.com/models/library.mod

The file 'library.mod' will be http-transferred to the circuit directory and included as a library. For subsequence simulations, in the interest of avoiding downloading the file each time you run the simulation, you can edit the .lib statement to

.lib library.mod

Note that if the URL you specify doesn't exist, most web servers don't return an error, but return a html web page to be displayed in your web browser that explains the error. LTspice can't always read these pages as error conditions so you may get some cryptic error message when the simulation tries to proceed with the included html language error page included in the simulation as valid SPICE syntax.

If the http-transferred URL is a .pdf file, the simulation will abort after the download. For example the following deck will download this manual as a .pdf file:

* Dummy simulation to download the help file.

* The simulation will abort with an error, but

* you'll be left with the file scad3.pdf in the

* same directory containing the netlist.

.lib http://ltspice.linear.com/software/scad3.pdf

.end

Encrypted Libraries

LTspice can generate and read a special form of encrypted libraries. This allows one user to prepare a library that another user can use in a simulation without revealing the implementation of the library. A reasonable attempt has been made to make the encrypted library difficult to decode by unauthorized concerns, but it cannot be considered perfectly secure if for no other reason than it is implemented in software.

To prepare an encrypted library, you need to invoke LTspice from the command line with the command line option '-encrypt'. You will need to first backup the library because it will be replaced with the encrypted version. THERE EXISTS NO UTILITY TO CONVERT AN ENCRYPTED LIBRARY BACK TO CLEAR TEXT. Below summarizes the two steps:

1. Make a backup copy of the library. The

version you encrypt is deleted.

2. From a command line, type

scad3.exe -encrypt <filename>

The file <filename> will be replaced with an encrypted version. The encryption process will take a few minutes.

One this process is finished, you have an encrypted ASCII file. It's possible to add a copyright notice above the '* Begin:' line, but the first 9 lines of the file must remain unchanged and each line of copyright notice you add must begin with the character '*'.

That is, here an encrypted file written by LTspice:

* LTspice Encrypted File

*

* This encrypted file has been supplied by a 3rd

* party vendor that does not wish to publicize

* the technology used to implement this library.

*

* Permission is granted to use this file for

* simulations but not to reverse engineer its

* contents.

*

* Begin:

50 3E 46 0F FA 6E 67 FF B8 4D D9 62 14 32 60 24

36 71 35 0B 66 4F AD 52 B8 F5 9E 22 9F C0 18 8B

FB FE 1D...

you can change this to be

* LTspice Encrypted File

*

* This encrypted file has been supplied by a 3rd

* party vendor that does not wish to publicize

* the technology used to implement this library.

Ltspice Add Library

*

* Permission is granted to use this file for

* simulations but not to reverse engineer its

* contents.

*

* Copyright © 2005 Acme SPICE Modeling

* For additional information, see

* www.acmespicemodels.com

*

* Begin:

50 3E 46 0F FA 6E 67 FF B8 4D D9 62 14 32 60 24

36 71 35 0B 66 4F AD 52 B8 F5 9E 22 9F C0 18 8B

FB FE 1D...

Add Spice Library To Ltspice