AMY-5M
-
Hardware
Integration
Manual
Objective
Specification
Design-In
GPS.G5-MS5-08207
u-blox
proprietary
Page 28
your position is our focus
2.8 Layout
This
section
provides
important
information
for
designing
a
reliable
and
sensitive
GPS
system.
GPS
signals
at
the
surface
of
the
Earth
are
about
15dB
below
the
thermal
noise
floor.
Signal
loss
at
the
antenna
and
the
RF
connection
must
be
minimized
as
much
as
possible.
When
defining
a
GPS
receiver
layout,
the
placement
of
the
antenna
with
respect
to
the
receiver,
as
well
as
grounding,
shielding
and
jamming
from
other
digital
devices
are
crucial
issues
and
need
to
be
considered
very
carefully.
2.8.1 Footprint
Figure 15: Recommended footprint
2.8.2 Paste
Mask
The
Paste
Mask
shall
be
50
μ
m
smaller
than
the
copper
pads
with
a
paste
thickness
of
100
μ
m.
Be
careful
that
the
temperature
gradients
do
not
exceed
+2º/sec
and
-4º/sec.
The
paste
mask
outline
needs
to
be
considered
when
defining
the
minimal
distance
to
the
next
component.
These
are
recommendations
only
and
not
specifications.
The
exact
geometry,
distances,
stencil
thicknesses
and
solder
paste
volumes
must
be
adapted
to
the
specific
production
processes
(e.g.
soldering
etc.)
of
the
customer.
