Subcircuits in LTSPICE

15 May, 2011  Comments are off  SPICE & LTSPICE, Subcircuits

Your simulation is as good as quality of the models you are using!

At least it is no better than that. This is the reason why I would like to dig into LTSPICE Subcircuit topic and create a simple reference. I’m using it myself and hope it will save you some time also. Though, there is nothing new in this tutorial and most information is just recollection of different parts of LTSPICE and SPICE3 documentation. Read more

Subcircuit structure

15 May, 2011  2 Comments  SPICE & LTSPICE

1. Header
2. Netlist
   • Comments
   • Device Models
   • Major LTSPICE components, elementary devices
   • Major LTSPICE components, semiconductor devices
   • Major LTSPICE components, voltage and current sources
   • Major LTSPICE components, Special Functions
   • Expressions and functions in LTSPICE subcurcuits
3. End

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Distortion measurements with LTSPICE

20 Mar, 2011  23 Comments  SPICE & LTSPICE

LTSPICE is offering good capabilities for distortion analysis and simulations. All you have to do is to run transient analysis and then right click on the signal plot and use FFT command from view section of submenu. Or use .FOUR command and look for results in SPICE error LOG file from View menu. Though, you have to change a couple of default settings to be able to simulate and analyze harmonics, lower than – 60dB. Read more

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