eldo_user

Eldo Control Language
Rules for Testbench Location Resolution
Rules for Testbench Location Resolution
When a testbench is instantiated in a netlist or in a task simulation command, the location of its
definition must be resolved; in other words, Eldo must be able to locate the definition of the
testbenches. The standard Eldo .LIB or .INCLUDE commands can be used so that the testbench
definition can be indirectly found if it was not directly added in the base netlist.
Example
• File util_dev.cir
This file contains a testbench defining a voltage amplifier:
.define_testbench amp (in=1, out=0, vdd=10)
* .MODEL definition
.model q2n2222 npn is=1.9e-14 bf=150 vaf=100 ikf=.175
+ ise=5e-11 ne=2.5 br=7.5 var=6.38 ikr=.012 isc=1.9e-13
+ nc=1.2 rc=.4 cje=26p tf=.5e-9 cjc=11p tr=30e-9 xtb=1.5
+ kf=3.2e-16 af=1.0
* Circuit definition
c30 in 31 47u
r30 31 33 390
r31 vdd 33 50k
r32 33 0 15k
q30 out 33 0 q2n2222
r33 vdd out 750
.end_define_testbench
• File netlist.cir
The main netlist: a low-pass filter incorporating a voltage amplifier:
.include util_dev.cir
r1 1 2 10
l1 2 3 1.3m
c1 3 0 100n
r2 4 0 50k
* Testbench instantiation
.amp in=3 out=4 vdd=9
vb 9 0 5
v1 1 0 ac 1
* Commands
.ac dec 10 1 1g
.plot ac vdb(3) vdb(4) (-250,50)
.plot ac vp(3) vp(4) (-200,200)
.end
Related Topics
Defining and Running Simulations
Eldo® User's Manual, 15.3 813