by clicking on either one of the 2 buttons below,
http://fides.fe.uni-lj.si/spice/index.html
"SPICE OPUS is a free general purpose circuit simulator specially suited for optimization loops."
"It is a recompilation of the original Berkeley source code for Windows and Linux operating systems. Later Georgia Tech Research Institute's XSpice mixed-mode simulator was added to the Berkeley code. "
http://www.freeda.org/index.html
"... support for transient, harmonic balance and multi resolution analysis. ... large signal noise analysis captures phase noise ... also supports the integration of EM models in transient analysis. ... including the major transistor models ..."
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It can also simulate lasers with rate equations:
R. Pant, M. A. Neifeld, M. B. Steer, H. Kanj, and A. C. Cangellaris, “Electrical package impact on VCSEL-based optical interconnects ;” Optics Communication, Vol. 245, Issue 1-6, Jan. 2005, p. 315-332.
Houssam Kanj, Circuit-Level Modeling of Laser Diodes , M.S. Thesis, North Carolina State University, 2003
http://www.gpleda.org/index.html
contains: Schematic Capture, Netlist Generator, Symbol Library, etc, and...
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"ngspice : An improved SPICE"
http://www.gpleda.org/tools/ngspice/index.html
"Ngspice is a mixed-level/mixed-signal circuit simulator. Its code is based on three open source software packages: Spice3f5, Cider1b1 and Xspice."
It provides DC, AC, transient, noise analysis, etc.
http://www.itrs.net/models.html
GTX (Design chapter)
http://www.itrs.net/Links/2005ITRS/Linked%20Files/2005Files/Design/Website/GTX/index.html
"provides a robust, portable framework for interactive specification and comparison of modeling choices, e.g., for predicting system cycle time, die size, and power dissipation The GTX provides an open, portable framework for specification and comparison of alternative modeling choices. "
GTX seems the tool to generate the device params in Predictive Technology Model (http://www.eas.asu.edu/~ptm/)
http://www.geocities.com/fudinggecircuit/
Complete titile:
Fuding Ge's Design Ideas For Low Voltage, Low Power, Low Noise, High Speed, High Resolution, PVT Insensitive CMOS Analog/Mixed Signal ICs
Great site for all-level of analog/mixed-signal IC designers.
Yahoo is going to close geocities. Hopefully Fuding will move it to other platform.
http://www.staticfreesoft.com/
http://en.wikipedia.org/wiki/Electric_(software)
"Electric is used to draw schematics and to do integrated circuit layout. It can also handle hardware description languages such as VHDL and Verilog."
"Simulation two built-in simulators and interfaces to over a dozen industry tools (Spice, Verilog, etc.)"
http://en.wikipedia.org/wiki/Quite_Universal_Circuit_Simulator
http://qucs.sourceforge.net
"It gives you the possibility to set up a circuit with a graphical user interface and simulate the large-signal, small-signal and noise behaviour of the circuit."
"Pure digital simulations are also supported using VHDL and/or Verilog."
"Analysis Types:
S-parameter, including noise
AC, including noise
DC
Transient Analysis
Harmonic Balance (not yet finished)
Digital simulation: VHDL as well as Verilog-HDL
Parameter sweeps"
Question:
Where to find model parameters for transistors?
http://www.rdmiddlebrook.com/D_OA_Rules&Tools/index.asp
Some highlights:
"Chapter 14 shows how you get the "wrong" results when you don't choose the "right" injection configuration.
Chapter 15 shows how nonidealities ignored in the conventional single-loop model can be incorporated in an extra term in the formula, which predicts a drastically different step response from a high-frequency IC feedback amplifier example.
Chapter 16 is a real design-oriented example of how to get the proper response for a Darlington configuration, and features the CT. This is slightly different from the GFT CD, where the same example was treated by the GFT.
Chapter 17 is the classic switching regulator input filter problem, illustrating the use of the EET.
Chapter 18 shows how a current-programmed feedback loop in a switching regulator can be represented by a closed-loop equivalent circuit."
