#7 e source lookup table (for IBIS support)

[Anonymous]

lookup table for E and G sources would be good for better IBIS support:

E|G{name} {+node} {-node} TABLE {expression} = (invalue_1, outvalue_1) (invalue_2, outvalue_2) ... (invalue_n, outvalue_n)
Examples:
ECOMP 3 0 TABLE {V(1,2)} = (-2.5,5) (2.5,-5)

[Dietmar Warning]

OK - E/G sources are not possible (yet). But you can use b sources with pwl since release 20, e.g.:
Btest 1 0 I = pwl(v(1), -4,0, -2,2, 2,-2, 4,0)
Same for voltages.
DW

[Mario Baussmann]

Thanks for your comment.
But I can't understand: what is this pwl function inside the B source? I didnt find it in the ngspice manual and in http://newton.ex.ac.uk/teaching/CDHW/Electronics2/userguide/.

I tried:
vin 1 0 dc 0 sin(0 3 50 0 0)
Btest 1 0 I = pwl(v(1), -4,0, -2,2, 2,-2, 4,0)
Rtest 1 0 1k

but with the precompiled version for windows I get:
******
** ngspice-20 : Circuit level simulation program
** The U. C. Berkeley CAD Group
** Copyright 1985-1994, Regents of the University of California.
** Please submit bug-reports to: ngspice-bugs@lists.sourceforge.net
** Creation Date: Nov 18 2009 00:07:28
******
Circuit: testschaltung lookup-table
PWL-INFO: prepare_PTF_PWL building a PTF_PWL
internal error -- segmentation violation

[Dietmar Warning]

You are correct: there is something wrong with the windows binary - I will ask maintainer for that.

The following deck is working with the actual cvs version:

demonstrates usage of the pwl function in an ASRC
Vin 1 0 DC=0V
Btest 1 0 I = pwl(v(1), -4,-5, -2,0, 0,2, 2,0, 4,4)
.control
dc Vin -5 5 0.2
plot -Vin#branch vs v(1)
display all
.endc
.end

[Mario Baussmann]

Thanks for your help!
(I wait for the next release and will try again)

Mario

[Dietmar Warning]

Is solved in cvs by using B sources and will be avaiable in win binary in file section.