Here is a tool for the simulation folk:
Have you ever wanted to simulate a circuit (e..g long tail pair) with unequal transistors?
The attached tool calculate modified spice files with a defined deviation in percent from the nominal spice parameters.
1.) you need a transistor spice model file like bc847.mod
2.) you call the shell script "make_models.sh bc847.mod bc847_var.mod"
3.) the shell script generates a lot of transistor models with name like bc847_w10
or bc847_s5 (for the weak 10% and the strong 5% model) and stores it in the file bc847_var.mod
4.) you need a bourne shell (e.g. Cygwin under windows) for the script to work. The executeable model_var.exe is compiled for windows.
Copy it in a directory where it is found by the operating system (e.g. /usr/bin/ or set the PATH variable).
Have fun, Udo
Have you ever wanted to simulate a circuit (e..g long tail pair) with unequal transistors?
The attached tool calculate modified spice files with a defined deviation in percent from the nominal spice parameters.
1.) you need a transistor spice model file like bc847.mod
2.) you call the shell script "make_models.sh bc847.mod bc847_var.mod"
3.) the shell script generates a lot of transistor models with name like bc847_w10
or bc847_s5 (for the weak 10% and the strong 5% model) and stores it in the file bc847_var.mod
4.) you need a bourne shell (e.g. Cygwin under windows) for the script to work. The executeable model_var.exe is compiled for windows.
Copy it in a directory where it is found by the operating system (e.g. /usr/bin/ or set the PATH variable).
Have fun, Udo