I need a step by step guide of importing the Pspice models from Ti into OrCAD 16.3. I am particularly interested in the INA333 as for a project we are building an ECG machine. I need to run simulation of the circuit containing this Instrumental Amplifier as part of the project. My knowledge of Pspice is pretty basic.
Any help would be appreciated
Thanks
David
David,
STEP 1. In order to use the model provided in the web first you need to create a new analog and mixed AD project. Ignore this if you already have a project. See image below.
If asked to create the project based on an existing project, you can select the AnalogGNDSymbol.opj. This will include the most common used blocks to your project. e.g. voltage sources, analog components (i.e. resistors, caps, inductors, etc.), ground symbols, etc.
STEP 2. In the project manager go to the folder named "library" under "Design Resources", right click and press add file as depicted below.
The folder contains two files named INA333.lib and INA333.OLB which are the model and symbol libraries respectively. Add the .OLB file to the library folder. After you are done it should look like the following.
STEP 3. Expand the tree entry for the .OLB you just included, select the INA333 entry, right click and select Associate PSpice Model as depicted above on right.
STEP 4. The window depicted below on left should appear. Press the browse button as highlighted in the red box. Search and select the INA333.lib file this should populate the first entry under "matching models" query. Select the INA333, hit next, and the window below on right should appear. Using the pull down menus match each model terminal to its corresponding symbol pin and press finish.
You should get a dialog message saying "PSpice model "INA333" attached sucessfully to symbol "INA333"."
STEP 5. Edit your simulation profile. See image below.
After pressing the edit "Simulation Profile" button highlighted red in the image shown above, the following dialog will appear. Now follow the following steps
1. Select the "Configuration Files" tab.
2. Select "library" from the Category list box.
3. Browse for and select the "INA333.lib" file.
4. Add the library to the design by pressing "Add to Design".
Now the symbol and the model have been sucessfully added to your project and you should be able to add the INA333 from the part search in the PSpice environment.
At this point you should be able to include the amp to your design. When you close and open your project always repeat this last step to make sure that the library INA333.lib is included in the simulation library files. For some reason sometimes it gets dropped from the simulation libraries and you will get an error message saying that it can't file a model find the model file for the INA333 symbol. If this happens just add the INA333.lib to your design by pressing "Add to Design"
I hope this answers your question. Should you have any concerns please feel free to reply to this post. I did this using Orcad 16.0 but the steps should be similar.
-Marcos.
