<s>
CircuitLogix	B-Algorithm
is	O
a	O
software	O
electronic	B-Language
circuit	I-Language
simulator	I-Language
which	O
uses	O
PSpice	O
to	O
simulate	O
thousands	O
of	O
electronic	O
devices	O
,	O
models	O
,	O
and	O
circuits	O
.	O
</s>
<s>
CircuitLogix	B-Algorithm
supports	O
analog	O
,	O
digital	B-General_Concept
,	O
and	O
mixed-signal	O
circuits	O
,	O
and	O
its	O
SPICE	B-Protocol
simulation	O
gives	O
accurate	O
real-world	O
results	O
.	O
</s>
<s>
The	O
graphic	B-Application
user	I-Application
interface	I-Application
allows	O
students	O
to	O
quickly	O
and	O
easily	O
draw	O
,	O
modify	O
and	O
combine	O
analog	O
and	O
digital	B-General_Concept
circuit	B-Application
diagrams	I-Application
.	O
</s>
<s>
CircuitLogix	B-Algorithm
was	O
first	O
launched	O
in	O
2005	O
,	O
and	O
its	O
popularity	O
has	O
grown	O
quickly	O
since	O
that	O
time	O
.	O
</s>
<s>
In	O
2012	O
,	O
it	O
reached	O
the	O
milestone	O
of	O
250,000	O
licensed	O
users	O
,	O
and	O
became	O
the	O
first	O
electronics	B-Language
simulation	I-Language
product	O
to	O
have	O
a	O
global	O
installed	B-Operating_System
base	I-Operating_System
of	O
a	O
quarter-million	O
customers	O
in	O
over	O
100	O
countries	O
.	O
</s>
<s>
CircuitLogix	B-Algorithm
was	O
developed	O
by	O
Dr.	O
Colin	O
Simpson	O
,	O
an	O
electronics	O
professor	O
at	O
George	O
Brown	O
College	O
,	O
in	O
Toronto	O
,	O
Canada	O
,	O
and	O
John	O
(	O
Bud	O
)	O
Skinner	O
,	O
a	O
computer	B-Application
programmer	I-Application
.	O
</s>
<s>
The	O
professional	O
version	O
of	O
CircuitLogix	B-Algorithm
(	O
CircuitLogix	B-Algorithm
Pro	O
)	O
includes	O
over	O
10,000	O
device	O
models	O
,	O
as	O
well	O
as	O
8	O
virtual	O
instruments	O
.	O
</s>
<s>
3DLab	O
virtual	O
components	O
include	O
batteries	O
,	O
switches	B-Device
,	O
motors	O
,	O
lamps	O
,	O
resistors	O
,	O
inductors	O
,	O
capacitors	O
and	O
instruments	O
including	O
oscilloscopes	O
,	O
Signal	O
generators	O
,	O
and	O
frequency	O
counters	O
.	O
</s>
<s>
SPICE	B-Protocol
simulators	O
are	O
used	O
to	O
verify	O
that	O
analog	O
and	O
mixed-signal	O
circuits	O
will	O
yield	O
the	O
expected	O
outputs	O
.	O
</s>
<s>
A	O
schematic	O
netlist	O
file	O
and	O
circuit	O
input	O
values	O
are	O
fed	O
to	O
the	O
SPICE	B-Protocol
software	O
,	O
which	O
simulates	O
the	O
circuit	O
's	O
behavior	O
for	O
a	O
specified	O
length	O
of	O
time	O
.	O
</s>
<s>
CircuitLogix	B-Algorithm
allows	O
for	O
the	O
observation	O
of	O
voltage	O
and	O
current	O
levels	O
at	O
any	O
circuit	O
node	O
as	O
they	O
change	O
with	O
frequency	O
and	O
time	O
.	O
</s>
<s>
The	O
CircuitLogix	B-Algorithm
simulation	O
engine	O
is	O
based	O
on	O
Berkeley	O
SPICE	B-Protocol
,	O
and	O
contains	O
a	O
GUI	B-Application
to	O
make	O
circuit	O
design	O
easier	O
and	O
more	O
efficient	O
.	O
</s>
<s>
The	O
CircuitLogix	B-Algorithm
32-bit	O
SPICE	B-Protocol
engine	O
is	O
interactive	O
,	O
allowing	O
,	O
for	O
example	O
,	O
the	O
frequency	O
of	O
sources	O
to	O
be	O
changed	O
,	O
potentiometers	B-Device
adjusted	O
,	O
and	O
switches	B-Device
thrown	O
during	O
simulation	O
.	O
</s>
<s>
The	O
SPICE	B-Protocol
engine	O
is	O
fully	O
integrated	O
with	O
the	O
schematic	O
capture	O
and	O
waveform	O
tools	O
;	O
CircuitLogix	B-Algorithm
passes	O
schematic	O
edits	O
to	O
the	O
simulator	O
automatically	O
while	O
running	O
.	O
</s>
<s>
Components	O
such	O
as	O
fuses	O
,	O
LEDs	O
and	O
controlled	O
switches	B-Device
are	O
automatically	O
updated	O
in	O
the	O
schematic	O
as	O
the	O
simulation	O
runs	O
.	O
</s>
<s>
CircuitLogix	B-Algorithm
simulates	O
analog	O
,	O
digital	B-General_Concept
,	O
and	O
mixed	O
analog-digital	O
circuits	O
.	O
</s>
<s>
The	O
simulator	O
first	O
divides	O
the	O
circuit	O
into	O
analog	O
and	O
digital	B-General_Concept
portions	O
.	O
</s>
<s>
The	O
analog	O
circuitry	O
is	O
simulated	O
with	O
the	O
time-step	O
driven	O
SPICE	B-Protocol
engine	O
,	O
while	O
the	O
digital	B-General_Concept
parts	O
are	O
simulated	O
separately	O
with	O
an	O
event-driven	O
simulation	O
engine	O
.	O
</s>
<s>
The	O
CircuitLogix	B-Algorithm
digital	B-General_Concept
engine	O
was	O
developed	O
directly	O
in	O
.NET	B-Application
,	O
faster	O
than	O
SPICE	B-Protocol
macros	O
.	O
</s>
<s>
Because	O
the	O
simulator	O
automatically	O
performs	O
signal	O
conversion	O
,	O
it	O
is	O
possible	O
to	O
connect	O
any	O
analog	O
or	O
digital	B-General_Concept
part	O
to	O
any	O
other	O
.	O
</s>
<s>
The	O
system	O
’s	O
model	O
library	O
contains	O
hybrid	O
parts	O
for	O
analog-to-digital	O
and	O
digital-to-analog	O
conversion	O
.	O
</s>
<s>
CircuitLogix	B-Algorithm
is	O
a	O
mixed-mode	O
schematic	O
editor	O
,	O
and	O
includes	O
both	O
analog	O
and	O
event-driven	O
simulation	O
capabilities	O
:	O
any	O
simulation	O
may	O
contain	O
components	O
that	O
are	O
analog	O
,	O
event	O
driven	O
(	O
digital	B-General_Concept
or	O
sampled-data	O
)	O
,	O
or	O
a	O
combination	O
of	O
both	O
.	O
</s>
<s>
All	O
the	O
digital	B-General_Concept
models	O
in	O
CircuitLogix	B-Algorithm
provide	O
accurate	O
specification	O
of	O
propagation	O
time	O
and	O
rise/fall	O
time	O
delays	O
.	O
</s>
<s>
The	O
event-driven	O
algorithm	O
used	O
by	O
CircuitLogix	B-Algorithm
is	O
general-purpose	O
and	O
supports	O
non-digital	O
types	O
of	O
data	O
.	O
</s>
<s>
Because	O
the	O
event-driven	O
algorithm	O
is	O
faster	O
than	O
the	O
standard	O
SPICE	B-Protocol
matrix	O
,	O
simulation	O
time	O
is	O
greatly	O
reduced	O
for	O
circuits	O
that	O
use	O
event-driven	O
models	O
in	O
place	O
of	O
analog	O
models	O
.	O
</s>
<s>
Mixed-mode	O
simulation	O
is	O
handled	O
on	O
three	O
levels	O
by	O
CircuitLogix	B-Algorithm
:	O
(	O
a	O
)	O
with	O
primitive	O
digital	B-General_Concept
elements	O
that	O
use	O
timing	O
models	O
and	O
a	O
built-in	O
12-state	O
digital	B-General_Concept
logic	O
simulator	O
,	O
(	O
b	O
)	O
with	O
subcircuit	O
models	O
that	O
use	O
the	O
actual	O
transistor	B-Application
topology	B-Architecture
of	O
the	O
integrated	O
circuit	O
,	O
and	O
finally	O
,	O
(	O
c	O
)	O
with	O
In-line	O
Boolean	O
logic	O
expressions	O
.	O
</s>
<s>
These	O
two	O
modeling	O
techniques	O
use	O
SPICE	B-Protocol
to	O
solve	O
a	O
problem	O
while	O
the	O
third	O
method	O
,	O
digital	B-General_Concept
primitives	O
,	O
uses	O
mixed-mode	O
capability	O
.	O
</s>
