<s>
Gain	B-Algorithm
compression	I-Algorithm
is	O
a	O
reduction	O
in	O
differential	O
or	O
slope	O
gain	O
caused	O
by	O
nonlinearity	O
of	O
the	O
transfer	O
function	O
of	O
the	O
amplifying	O
device	O
.	O
</s>
<s>
Gain	B-Algorithm
compression	I-Algorithm
is	O
relevant	O
in	O
any	O
system	O
with	O
a	O
wide	O
dynamic	O
range	O
,	O
such	O
as	O
audio	O
or	O
RF	O
.	O
</s>
<s>
It	O
is	O
more	O
common	O
in	O
tube	O
circuits	O
than	O
transistor	B-Application
circuits	O
,	O
due	O
to	O
topology	O
differences	O
,	O
possibly	O
causing	O
the	O
differences	O
in	O
audio	O
performance	O
called	O
"	O
valve	O
sound	O
"	O
.	O
</s>
<s>
The	O
effect	O
is	O
also	O
present	O
in	O
transistor	B-Application
circuits	O
.	O
</s>
<s>
Clipping	B-Algorithm
,	O
as	O
a	O
form	O
of	O
signal	O
compression	O
,	O
differs	O
from	O
the	O
operation	O
of	O
the	O
typical	O
studio	O
audio	O
level	O
compressor	O
,	O
in	O
which	O
gain	B-Algorithm
compression	I-Algorithm
is	O
not	O
instantaneous	O
(	O
delayed	O
in	O
time	O
via	O
attack	O
and	O
release	O
settings	O
)	O
.	O
</s>
<s>
Clipping	B-Algorithm
destroys	O
any	O
audio	O
information	O
which	O
is	O
over	O
a	O
certain	O
threshold	O
.	O
</s>
<s>
Gain	B-Algorithm
compression	I-Algorithm
is	O
not	O
linear	O
and	O
,	O
as	O
such	O
,	O
its	O
effect	O
is	O
one	O
of	O
distortion	O
,	O
due	O
to	O
the	O
nonlinearity	O
of	O
the	O
transfer	O
characteristic	O
which	O
also	O
causes	O
a	O
loss	O
of	O
'	O
slope	O
 '	O
or	O
'	O
differential	O
 '	O
gain	O
.	O
</s>
<s>
In	O
clipping	B-Algorithm
,	O
the	O
signal	O
is	O
abruptly	O
limited	O
to	O
a	O
certain	O
amplitude	O
and	O
is	O
thereby	O
distorted	O
in	O
keeping	O
under	O
that	O
level	O
.	O
</s>
<s>
Soft	B-Algorithm
clipping	I-Algorithm
or	O
limiting	O
means	O
there	O
is	O
n't	O
a	O
sharp	O
knee	O
point	O
in	O
the	O
transfer	O
characteristic	O
.	O
</s>
<s>
A	O
sine	O
wave	O
that	O
has	O
been	O
softly	O
clipped	B-Algorithm
will	O
become	O
more	O
like	O
a	O
square	O
wave	O
,	O
with	O
more	O
rounded	O
edges	O
,	O
but	O
will	O
still	O
have	O
many	O
extra	O
harmonics	O
.	O
</s>
<s>
With	O
any	O
signal	O
,	O
as	O
the	O
input	O
level	O
is	O
increased	O
beyond	O
the	O
linear	O
range	O
of	O
the	O
amplifier	O
,	O
gain	B-Algorithm
compression	I-Algorithm
will	O
occur	O
.	O
</s>
<s>
A	O
transistor	B-Application
's	O
operating	O
point	O
may	O
move	O
with	O
temperature	O
,	O
so	O
higher	O
power	O
output	O
may	O
lead	O
to	O
compression	O
due	O
to	O
collector	O
dissipation	O
.	O
</s>
<s>
With	O
gain	B-Algorithm
compression	I-Algorithm
,	O
the	O
opposite	O
is	O
true	O
,	O
its	O
output	O
is	O
constant	O
.	O
</s>
<s>
Gain	B-Algorithm
compression	I-Algorithm
in	O
RF	O
amplifiers	O
is	O
similar	O
to	O
soft	B-Algorithm
clipping	I-Algorithm
.	O
</s>
<s>
However	O
,	O
in	O
narrowband	O
systems	O
,	O
the	O
effect	O
looks	O
more	O
like	O
gain	B-Algorithm
compression	I-Algorithm
simply	O
because	O
the	O
harmonics	O
are	O
filtered	O
out	O
after	O
amplification	O
.	O
</s>
<s>
Many	O
data	O
sheets	O
for	O
RF	O
amplifiers	O
list	O
gain	B-Algorithm
compression	I-Algorithm
rather	O
than	O
distortion	O
figures	O
because	O
it	O
's	O
easier	O
to	O
measure	O
and	O
is	O
more	O
important	O
than	O
distortion	O
figures	O
in	O
nonlinear	O
RF	O
amplifiers	O
.	O
</s>
<s>
the	O
output	O
is	O
clipped	B-Algorithm
.	O
</s>
<s>
To	O
see	O
the	O
same	O
thing	O
at	O
1GHz	O
,	O
an	O
oscilloscope	O
with	O
a	O
bandwidth	B-Algorithm
of	O
at	O
least	O
10GHz	O
is	O
needed	O
.	O
</s>
<s>
For	O
example	O
,	O
if	O
channel	O
54	O
is	O
transmitting	O
6MW	O
of	O
AM	B-Device
,	O
FM	B-Application
,	O
and	O
PM	B-Device
,	O
the	O
RF	O
front	O
end	O
,	O
expecting	O
−80dBm	O
,	O
would	O
be	O
grossly	O
overloaded	O
and	O
generate	O
mixing	O
products	O
.	O
</s>
<s>
This	O
is	O
a	O
typical	O
effect	O
of	O
gain	B-Algorithm
compression	I-Algorithm
.	O
</s>
<s>
Power	B-Architecture
compression	I-Architecture
is	O
a	O
form	O
of	O
gain	B-Algorithm
compression	I-Algorithm
that	O
takes	O
place	O
in	O
loudspeaker	B-Device
voice	I-Device
coils	I-Device
when	O
they	O
heat	O
up	O
and	O
increase	O
their	O
resistance	O
.	O
</s>
