Open Source LASER Range Finder

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Stuttgart

A commenters blog had this as their background for s Stuttgart oriented blog.
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YOUR POST TEXT HERE

Adding background image in a post

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Setting LTspice up for use with Electric

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

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.

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Random Finds

LTSPICE – Creating Hierarchical Blocks

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MOSFET Simulation Guide

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.

A 180 Nanometer MOSFET Model – Using TSMC Transistor Models from MOSIS in LT Spice

 

 

Archive: The LTSPICE library file made up from MOSIS files and LTSPICE test analysis .asc file: 180nM-NMOS-PMOS-T92Y-MOSIS-LTSPICE-Files-V2.7z   

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.

NOTE: When I vary the threshold voltage of the models with this version I do not see any changes in FET analysis.  I suspect something is not quite right with this setup.  No errors are flagged and everything runs.

 

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 from the process follow. If you want to recreate the process for other MOSIS files they will be helpful.

Research Links

Model Files – No modifications. As is from MOSIS

Notes

  • To bring up the components attributes editor  for a part hold control button down and right click on the part.  Set the Prefix = X to set the components attributes editor to come up each time you right click on the part.

 

Auxiliary Links

Entangled Photon Pair Sources

Research Links

Open Source Software: Timing Editor

I needed to draw a timing diagram for a mixed signal class I took.  I found 

The problem I was solving is shown below in the image.  It's rather tedious to figure out.  You have to remember that once a gate capacitance is charged up it ideally holds that charge until it is connected to again by either Vdd or Ground.

 

The gate turns out to be a falling edge triggered flip flop.  You can see it in the wikipedia:flip flop article that includes this diagram which was found after I did the timing diagram.

 

 

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