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PNP
Network
Terminology
(
netterm
)
p
-
n
-
p
*
The
Free
On
-
line
Dictionary
of
Computing
(
foldoc
)
1
.
A
type
of
{
bipolar
transistor
}
consisting
of
a
layer
of
N
-
doped
{
semiconductor
} (
the
"
base
")
between
two
P
-
doped
layers
(
the
"
collector
"
and
"
emitter
").
PNP
transistors
are
commonly
operated
with
the
emitter
at
{
ground
}
and
the
collector
at
a
negative
{
voltage
}.
In
the
1960s
,
the
germanium
PNP
transistor
was
the
cheapest
and
best
for
use
at
ordinary
temperatures
.
The
{
leakage
current
}
from
collector
to
base
in
this
type
of
device
is
larger
than
for
the
silicon
transistor
,
and
also
varies
more
with
temperature
.
The
effect
of
these
deficiencies
can
be
lessened
by
proper
biasing
and
feedback
,
which
can
make
the
circuit
both
serviceable
and
reliable
.
Neither
germanium
nor
PNP
transistors
are
as
common
today
.
The
voltages
used
on
a
PNP
transistor
are
inverted
when
compared
with
{
vacuum
tubes
}.
Further
,
the
behaviour
of
vacuum
tubes
is
usually
described
in
terms
of
{
voltages
}
whereas
transistors
are
better
described
in
terms
of
{
current
}.
2
.
{
plug
and
play
}.
(
1997
-
05
-
05
)
V
.
E
.
R
.
A
. --
Virtual
Entity
of
Relevant
Acronyms
(
June
2006
) (
vera
)
Plug
'
N
Play
(
PNP
), "
PnP
"
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