Re: [Gnucap-devel] Re: [Help-gnucap] how to model sinusoidal dependence on charge?

[address@hidden]

Hello,

A long time ago I wrote a file to extend "Voltage controlled voltage source"
and Al Davis wrote :
> I would prefer that it is done as 5 separate files, one for each 
function,
> using "bm_tanh.cc" as a style guide.  If you can do this, I will 
include it
> with the main distribution, along with posy and tanh that are already 
there.
Now I have done it and feel free to use it as you like.

E1 (out 0 in 0) expon                       means : out=e^(in)
E1 (out 0 in 0) expon(3.0,5.0)              means : out=e^(3.0*in+5.0)
E1 (out 0 in 0) sinus(314,-78.5)            means : out=sin(314*in 
-0,785) = -cos(314*in)
E1 (out 0 0 0) ramp                         means : out=t where t is the 
time of the simulation
V1 (out 0) ramp(2.0,3.0)                    means : out=2.0*t+3.0
E1 (out 0 0 0) ln(2.0,3.0)                  means : out=log(2.0 * in + 3.0)
E1 (out 0 0 0) tan(2.0,3.0)                 means : out=tan(2.0 * in + 3.0)

Default parameters are a=1.0 and b=0.0 for a*in+b, sin(a*in+b), 
exp(a*in+b),...

If you want to build the signal out = sin(3*t+5) e^(-6*t)  use :
V1 1 0 ramp
E1 (2 0 1 0) sinus(3.0,5.0)
E2 (3 0 1 0) expon(-6.0,0.0)
X1 2 3 4 Mul

Where the subckt Mul is defined by :
.SUBCKT Mul in1 in2 out
G1 1 0 in1 0 1.0
G2 1 0 VCR 0 in2 1.0
E1 out 0 1 0 1.0
.ENDS

It works but the names are quite ambiguous : exp!=expon, sin!=sinus, 
tan!=tanh
Morever, I don't know how such an extension fits with the convergence 
algorithm.
So I distribute it in the hope that it will be useful but WITHOUT ANY 
WARRANTY ;-)

Al Davis wrote :
> 1. You don't need to change the makefile to use it.  Instead,
> compile it as a shared object (.so on Linux) and use the "load"
> command to bring it in.  This way, when the stable version comes
> out, and the distros package it, you can add things like this
> without recompiling the whole simulator.
>
> "g++ -shared -fPIC -o bm_func.so bm_func.cc"
>
> then from gnucap:
>
> "load /full/path/to/bm_func.so"
>
> or on the command line:
>
> "gnucap -a /full/path/to/bm_func.so  ......."

However, this doesn't work on cygwin/windows xp
I used g++ -shared -fPIC -c -o bm_xxx.so bm_xxx.cc
but I failed to load it in gnucap : cygwin Permission denied
So I changed two lines in the Makefile :

# behavioral modeling functions
BM_SRCS = \
bm_complex.cc bm_cond.cc bm_exp.cc bm_fit.cc bm_generator.cc \
bm_model.cc bm_poly.cc bm_posy.cc bm_pulse.cc bm_pwl.cc bm_sffm.cc \
bm_sin.cc bm_tanh.cc bmm_table.cc bmm_semi.cc bm_ramp.cc bm_expon.cc \
bm_ln.cc bm_sinus.cc bm_tan.cc

am__objects_5 = bm_complex.$(OBJEXT) bm_cond.$(OBJEXT) \
    bm_exp.$(OBJEXT) bm_fit.$(OBJEXT) bm_generator.$(OBJEXT) \
    bm_model.$(OBJEXT) bm_poly.$(OBJEXT) bm_posy.$(OBJEXT) \
    bm_pulse.$(OBJEXT) bm_pwl.$(OBJEXT) bm_sffm.$(OBJEXT) \
    bm_sin.$(OBJEXT) bm_tanh.$(OBJEXT) bmm_table.$(OBJEXT) \
    bmm_semi.$(OBJEXT) bm_ramp.$(OBJEXT) bm_expon.$(OBJEXT) \
    bm_ln.$(OBJEXT) bm_sinus.$(OBJEXT) bm_tan.$(OBJEXT)

The whole package is here : 
http://jacques.lecoupanec.free.fr/GnuCap/contrib.tar