<s>
SpectreRF	B-Algorithm
is	O
an	O
option	O
to	O
the	O
Spectre	B-Algorithm
Circuit	I-Algorithm
Simulator	I-Algorithm
from	O
Cadence	O
Design	O
Systems	O
.	O
</s>
<s>
It	O
adds	O
a	O
series	O
of	O
analyses	O
that	O
are	O
particularly	O
useful	O
for	O
RF	B-Application
circuits	I-Application
to	O
the	O
basic	O
capabilities	O
of	O
Spectre	O
.	O
</s>
<s>
SpectreRF	B-Algorithm
was	O
first	O
released	O
in	O
1996	O
and	O
was	O
notable	O
for	O
three	O
reasons	O
.	O
</s>
<s>
First	O
,	O
it	O
was	O
arguably	O
the	O
first	O
RF	O
simulator	O
in	O
that	O
it	O
was	O
the	O
first	O
to	O
be	O
designed	O
for	O
large	O
bipolar	O
and	O
CMOS	O
RF	B-Application
circuits	I-Application
;	O
it	O
used	O
shooting	O
methods	O
as	O
its	O
base	O
algorithm	O
;	O
and	O
it	O
pioneered	O
the	O
use	O
of	O
Krylov	O
subspace	O
methods	O
.	O
</s>
<s>
The	O
use	O
of	O
shooting	O
methods	O
gave	O
SpectreRF	B-Algorithm
remarkable	O
robustness	O
and	O
the	O
Krylov	O
methods	O
gave	O
it	O
capacity	O
that	O
was	O
roughly	O
100	O
times	O
greater	O
than	O
existing	O
simulators	O
at	O
the	O
time	O
.	O
</s>
<s>
These	O
simulators	O
were	O
based	O
on	O
harmonic	O
balance	O
and	O
could	O
reliably	O
simulate	O
circuits	O
with	O
tens	O
of	O
transistors	O
whereas	O
SpectreRF	B-Algorithm
could	O
simulate	O
circuits	O
with	O
thousands	O
of	O
transistors	O
.	O
</s>
<s>
SpectreRF	B-Algorithm
added	O
the	O
Periodic	O
Steady	O
State	O
and	O
Periodic	O
small-signal	O
analyses	O
to	O
Spectre	O
.	O
</s>
<s>
SpectreRF	B-Algorithm
pioneered	O
a	O
variety	O
of	O
periodic	O
small-signal	O
analyses	O
,	O
including	O
periodic	O
AC	O
(	O
pac	O
)	O
,	O
periodic	O
noise	O
(	O
pnoise	O
)	O
,	O
periodic	O
transfer	O
function	O
(	O
)	O
,	O
periodic	O
s-parameter	O
(	O
psp	O
)	O
and	O
periodic	O
stability	O
(	O
pstb	O
)	O
.	O
</s>
<s>
After	O
its	O
introduction	O
,	O
SpectreRF	B-Algorithm
quickly	O
became	O
the	O
dominant	O
simulator	O
for	O
RF	O
integrated	O
circuits	O
,	O
and	O
was	O
instrumental	O
in	O
establishing	O
Spectre	O
as	O
the	O
most	O
popular	O
circuit	O
simulator	O
for	O
integrated	O
circuits	O
.	O
</s>
<s>
Eventually	O
the	O
dominance	O
of	O
SpectreRF	B-Algorithm
faded	O
as	O
the	O
use	O
of	O
Krylov	O
subspace	O
methods	O
propagated	O
to	O
other	O
simulators	O
,	O
particularly	O
those	O
based	O
on	O
harmonic	O
balance	O
.	O
</s>
<s>
SpectreRF	B-Algorithm
now	O
provides	O
harmonic	O
balance	O
in	O
addition	O
to	O
shooting	O
methods	O
,	O
both	O
of	O
which	O
are	O
accelerated	O
using	O
Krylov	O
subspace	O
methods	O
.	O
</s>
<s>
SpectreRF	B-Algorithm
was	O
developed	O
by	O
Ken	O
Kundert	O
,	O
Jacob	O
White	O
,	O
and	O
Ricardo	O
Telichevesky	O
.	O
</s>
