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List of free analog and digital electronic circuit simulators, available for Windows, macOS, Linux, and comparing against UC Berkeley SPICE.The following table is split into two groups based on whether it has a graphical visual interface or not.
Of these, LTSpice and Micro-cap are free proprietary applications based on SPICE. Micro-Cap was released as freeware in July 2019, when its parent company Spectrum Software closed down while LTSpice has been free for a long time.
For mixed signal circuit simulation ngspice allows users to create a user-defined node definition file (UDN) of a new device model interface. The implementation of the node is created and simulated by using C language with macros which is compiled by standard C/C++ compilers. New models can be added to the simulator using:
EasyEDA is an integrated browser-based tool for schematic capture, SPICE circuit simulation (based on Ngspice) and PCB layout. [3] [4]Import from Altium Designer, CircuitMaker, Eagle, Kicad and LTspice file formats as well as generic SPICE netlists is supported.
LTspice schematics are stored as an ASCII text file with a filename extension of "asc". [30] The following example shows the contents from a small LTspice schematic file for a simple RC circuit with four schematic symbols: V1 is 10 volt DC voltage source, R1 is 1K ohm resistor, C1 is 1 uF capacitor, ground.
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It reads a netlist file augmented with commands, performs simulations, and finally produces a dataset file. It can also report errors. The GUI includes a text editor which can display netlists and simulation logging information. It is handy to edit files related to certain components (e.g. SPICE netlists, or Touchstone files).