skill script to resolve resistor network?

[Rajeswaran M]

Is there any skill script available to resolve series-parallel
resistor combinations? What I need is I just want to select list of
resistors in my schematics and press a bindkey and get the equivalent
resistance. I dont want to do simulation since time is concern.

 

[Frank E. Gennari]

On Mon, 04 Apr 2005 17:12:58 +0530, Rajeswaran M wrote:

Is there any skill script available to resolve series-parallel
resistor combinations? What I need is I just want to select list of
resistors in my schematics and press a bindkey and get the equivalent
resistance. I dont want to do simulation since time is concern.

I've written something like this for C++, but not for SKILL. If your
resistor network can be subdivided into purely series and purely parallel
sub-nets, then you can probably use a recursiv traversal of the subnets to
compute the equivalent resistance. In the general case, a simple steady
state simulation can be used to determine 'R'. If a voltage 'V' is applied
to the terminals of the resistor network, the current 'I' can be used to
compute the equivalent resistance as 'R=V/I'. This simulation involves
using matrix algebra to solve a system of N equations and N unknowns,
where N is the number of nets in the circuit. The worst case runtime is
something like N^3 for the simplest algorithm, but can be as low as N^2
for more complex algorithms that you would find in real simulators. You
might be able to find a SKILL script somewhere that does this, but if not
you can possibly put something together by doing a web search for "nodal
analysis". Good luck.

Frank