SPICE

LTSPICE NetList

I want LTSPICE or otherwise to put out a spice deck like netlist as shown in the photo inset and the video embedded below. 

 I have not yet found a way to get this type of output.  All the output formats you can select for export in LTSPICE have the form:

Node#1

RefDes1.Pin1, RefDes2.Pin1 …….

Node#2

RefDes1.Pin2

Which of course is suited to pcb layout programs but not what I am trying to do.   See ExpressPCB Netlist format.

Research Links

By Fudgy McFarlen, ago

LTSPICE Behavioral Modeling

Research Links

Nap0's  Control Library

To use this the library (text file) control.lib must be placed in the directory:


.\LTC\SwCADIII\lib\sub


The symbol files contained in control.zip must be placed in the directory:


.\LTC\SwCADIII\lib\sym\control 


(best in the new to be added directory control, so these new blocks do not mix up with the regular components).


Then the symbols are available to be selected amongst the regular components

By Fudgy McFarlen, ago

Setting LTspice up for use with Electric

Research Links

LTspice is provided courtesy of Linear Technology, Inc. and authored by Mike Engelhardt. Possible contact for topo.

By Fudgy McFarlen, ago

LTspice Modeling a transformer

I had some issues getting a simple transformer model to run under LTSPICE.  

Archive: Ideal-Transformer.asc   Uses only standard LTSPICE parts.  Should work straight out of the box.

Research Links

Random Finds

By Fudgy McFarlen, ago

MOSFET Simulation Guide Self Defined MOSFET Model

I have wanted to use the SPICE MOSFET model more closely for while and found this guide: MOSFET Simulation Guide

With it I hope to be able to finally crack the problem of changing the threshold voltage.  Up till now when I have gone into the text of the model files for MOSFETs and altered Vth0 I have not seen any material change in the threshold voltage.  Obviously I am doing something wrong or do not understand how the SPICE simulator is going about its business.

Research Links

 

Partial solution to change threshold voltage:

Archive: This LTSPICE archive has model files that are used by using an nmos4 and pmos4 symbol.  Thus there is no subcircuit statements used in the library file.

NOTE: With this version  when I vary the threshold voltages I see the expected resultant change in the analysis output.

180nm analysis and model files 

The archive file should work straight out of the box after extraction. Make a directory and extract to it.  It has the library file, symbols and an LTSPICE test circuit.

 

 

Notes

  • The unaltered diode connected voltages with 10uAmps agrees with both methodologies.
By Fudgy McFarlen, ago