GlobalTop MT3337 Series Supplement
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th
Rd, Science
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5051268 / Fax: +886
GlobalTop Technology Inc.
GPS Module
Application Notes
(MT3337 series)
evision: A00
Technical Document
Reference layout, design tips, guides, and cautions for GlobalTop GPS modules.
This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced,
permission of GlobalTop Tech Inc
. Specifications subject to change without prior notice.
GlobalTop Technology Inc. All Rights Reserved.
Rd, Science
-Based Industrial Park, Tainan, 741, Taiwan, R.O.C.
5051268 / Fax: +886
-6-5053381 / Email: sales@gtop-tech.com
/ Web:
GlobalTop Technology Inc.
GPS Module
Application Notes
(MT3337 series)
Reference layout, design tips, guides, and cautions for GlobalTop GPS modules.
Ver. A00
This document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced,
into any other format without prior
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/ Web:
www.gtop-tech.com
Reference layout, design tips, guides, and cautions for GlobalTop GPS modules.
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Module Application Notes
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Version History
Title
:
GlobalTop
GPS Module Application Notes
Subtitle
:
GPS
Module
Doc Type
:
Technical Document
Revision
Date
A00 2014-07-0
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prior permission of GlobalTop Tech Inc
.
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Module Application Notes
(MT3337 series)
GPS Module Application Notes
(MT3337
series)
Module
Technical Document
Editor
Description
7
ROCK First Release
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Module Application Notes
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Table of Contents
Table of Contents
................................
Attention
................................
Technical upport
................................
1. Introduction
................................
2. General Rules for Design-
in
2.1 Circuit Design
................................
2.1.1 Power supply VCC
................................
2.1.2 VBACKUP backup battery
2.1.3 UART 0 (RX/TX) –
Serial Interface
2.1.4 GND-Ground
................................
2.1.5 Antenna Co
mpliance Design
2.1.6 1PPS
................................
2.1.7 3D_Fix
................................
2.2 Layout Guideline
................................
2.2.1 Layout underneath the GPS module
2.2.2 Keep far away from high profile or metal canned components
2.2.3 Placement
................................
2.2.4 Trace
................................
2.2.5 Ground Segmentation
2.2.6 Ground Plane
................................
3. Thermal Profile for MD Modules
4. Troubleshooting
................................
5. Contact
................................
Appendix I: uper Capa
citor Design
Appendix II: 50 Ω Antenna Matching
Appendix III: UART to R 232 Interface
Appendix IV: UART to U B Interface
Appendix V: How to efficiently transfer 1PP through extended distances
Appendix VI: Caution for Reflow oldering Process
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.
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Module Application Notes
(MT3337 series)
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
in
................................................................
................................
................................
................................
................................
................................
................................
................................
2.1.2 VBACKUP backup battery
................................................................
................................
Serial Interface
................................
................................
................................
................................
................................
mpliance Design
................................................................
................................
................................
................................................................
................................
................................
................................................................
................................
................................
................................
................................
2.2.1 Layout underneath the GPS module
................................
................................
2.2.2 Keep far away from high profile or metal canned components
................................
................................
................................
................................
................................
................................................................
................................
2.2.5 Ground Segmentation
................................................................
................................
................................
................................
................................
3. Thermal Profile for MD Modules
................................
................................
................................
................................
................................
................................
................................
................................
citor Design
................................
................................
Appendix II: 50 Ω Antenna Matching
................................
................................
Appendix III: UART to R 232 Interface
................................
................................
Appendix IV: UART to U B Interface
................................
................................
Appendix V: How to efficiently transfer 1PP through extended distances
Appendix VI: Caution for Reflow oldering Process
................................
................................
3
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Appendix V: How to efficiently transfer 1PP through extended distances
................................. 28
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... 33
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Attention
Please
read carefully before you start
If you use GPS receiver inside buildings, tunnels, or besides any huge objects, the GPS
signals might be cut-
off or disturbed. Plea
malfunctioned.
This application note provides
design using GPS modules. For detailed module specification, please refer to the
corresponding datasheet of GPS module.
GPS Module is an electrostatic sensitive device, please
directly, please follow ESD safety rule when handling.
For the first time, it
is strongly recommended to test
for at least 10 to 15 minutes to ensure
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.
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Module Application Notes
(MT3337 series)
read carefully before you start
If you use GPS receiver inside buildings, tunnels, or besides any huge objects, the GPS
off or disturbed. Plea
se do not assume the receiver
This application note provides
the necessary guidelines leading to a
successful
design using GPS modules. For detailed module specification, please refer to the
corresponding datasheet of GPS module.
GPS Module is an electrostatic sensitive device, please
DO NOT
touch GPS module
directly, please follow ESD safety rule when handling.
is strongly recommended to test
the device
outdoor
for at least 10 to 15 minutes to ensure
full ephemeris data received.
4
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If you use GPS receiver inside buildings, tunnels, or besides any huge objects, the GPS
se do not assume the receiver
is
successful
system
design using GPS modules. For detailed module specification, please refer to the
touch GPS module
outdoor
s with open sky
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Module Application Notes
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Technical Support
If you have any technical problems or cannot find the required information in our
documents, please feel free to contact us for technical support. Below is a list of information
which you can provide
to us to help us to
necessary solution:
1.
Your company name and website
2.
Description about application and system
3. GPS module type
4. GPS firmware version
5. Description of the question or problems encountered, together with
or videos files
― Test setup
― The p
roblem or issue shown in
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.
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Module Application Notes
(MT3337 series)
Technical Support
If you have any technical problems or cannot find the required information in our
documents, please feel free to contact us for technical support. Below is a list of information
to us to help us to
determining the
source of the proble
Your company name and website
Description about application and system
5. Description of the question or problems encountered, together with
roblem or issue shown in
figures
5
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If you have any technical problems or cannot find the required information in our
documents, please feel free to contact us for technical support. Below is a list of information
source of the proble
m and the
5. Description of the question or problems encountered, together with
figures, pictures
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Module Application Notes
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1. Introduction
GlobalTop has various
GPS modules designed for many different applications.
The application note is
compliant
Stand Alone GPS module: Gmm
-
Built-in Patch Antenna Module
:
tand
A
lone
Module
Built
-
in
Patch
Antenna
Module
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.
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Module Application Notes
(MT3337 series)
GPS modules designed for many different applications.
compliant
with the models listed below using MT3337
chip
-
r1
:
PA6C-R
Gmm-r1
PA6C-R
6
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chip
:
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2. General Rules for Design
In order to obtain good GPS performances, there are some rules which require
GPS module.
2.1 Circuit Design
Compatible Model: Gmm-r1
,
2.1.1 Power supply VCC
It is
necessary to provide a clean and stable power supply for our GPS module in order to obtain
good performances.
Unstable power source will have a significant negative impact on the GPS
performance
. To achieve this, the Vcc ripple must be controlled under 50
also some important suggestions for main power circuit design:
(1).
Add ferrite bead, power choke or low pass filter for power noise reduction
(2). linear regulator
is better than
(3). Use enough decoupling
capacitors
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prior permission of GlobalTop Tech Inc
.
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Module Application Notes
(MT3337 series)
2. General Rules for Design
-in
In order to obtain good GPS performances, there are some rules which require
attentions for using
,
PA6C-R
necessary to provide a clean and stable power supply for our GPS module in order to obtain
Unstable power source will have a significant negative impact on the GPS
. To achieve this, the Vcc ripple must be controlled under 50
mV
pp
.
In addition, there are
also some important suggestions for main power circuit design:
Add ferrite bead, power choke or low pass filter for power noise reduction
is better than
switch DC/DC power supplier in ripple
capacitors
beside VCC for stable voltage.
Power design for GPS module
7
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attentions for using
necessary to provide a clean and stable power supply for our GPS module in order to obtain
Unstable power source will have a significant negative impact on the GPS
In addition, there are
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Module Application Notes
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2.1.2 VBACKUP
backup battery
Compatible Model: Gmm-r1
,
There are
2 applications for appl
Application 1:
Backup power can be used
when
data. For a short term VCC off, with
shorter Time-to-First-Fix, and
short
For most system, i
t is recommended to
rechargeable coin battery
, super cap
About super capacitor
reference
The module has a built-
in battery recharge circuit. I
module is power on.
Application 2:
GPS module has a built-
in charging
battery is not installed at the VBACKUP, the module will still function but only that the module will
perform cold start at each power on event.
The
rechargeable
Built
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.
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Module Application Notes
(MT3337 series)
backup battery
,
PA6C-R
2 applications for appl
ying VBACKUP to GPS module.
when
the main power is not supplied to
keep RTC running and navigation
data. For a short term VCC off, with
this backup power, the GPS module
is capable of
short
hot start time at next power on.
t is recommended to
provide the module
with backup power (
, super cap
) See figure for reference design.
reference
design, please refer to Appendix I:
uper Capacitor
in battery recharge circuit. I
t charges the rechargeable
coin battery while the
in charging
circuit which charges the rechargeable
coin battery. If the coin
battery is not installed at the VBACKUP, the module will still function but only that the module will
perform cold start at each power on event.
rechargeable
coin battery to the VBACKUP of the module
Built
-
in a charging
circuit
for GPS module
8
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keep RTC running and navigation
is capable of
a faster TTFF,
with backup power (
e.g. Li-Ion
uper Capacitor
Design.
coin battery while the
coin battery. If the coin
battery is not installed at the VBACKUP, the module will still function but only that the module will
coin battery to the VBACKUP of the module
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Module Application Notes
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2.1.3 UART 0 (RX/TX) –
erial Interface
Compatible Model: Gmm-r1
,
(1) UART is the TTL level
interface
(2) Placing damping resistor on
the R
host MCU or high speed digital logics.
suppress
interference. Since the damping resistor is wire
as choke coil.
(3) Please don’t connect diode
(s)
adve
rsely affect RX/TX signal level
(4) If RS232 logic-
level is needed
more information p
lease refer to
(5) If USB logic-
level is needed for any
“UART to U B Interface”
in
2.1.4 GND-Ground
Compatible Model: Gmm-r1
,
Make sure all GND pins of module are
Please refer to “2.2.5
Ground Segmentation
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.
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Module Application Notes
(MT3337 series)
erial Interface
,
PA6C-R
interface
that carries the baud rate rangi
ng from 4800 bps to 115200 bps.
the R
X and TX of the GPS module could limit the
interference
host MCU or high speed digital logics.
Fine tuning the damping resistor is required
interference. Since the damping resistor is wire
wound
component and may function
(s)
to RX/TX as it will decrease signal driving
capability which might
rsely affect RX/TX signal level
. In some cases no data output will occur.
level is needed
for any particular application the level shifter
will be
lease refer to
“UART to R 232 Interface” in Appendix
III.
level is needed for any
particular application. F
or more information
in
Appendix IV.
,
PA6C-R
Make sure all GND pins of module are
connected to a good ground plane.
Ground Segmentation
”.
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ng from 4800 bps to 115200 bps.
interference
from
Fine tuning the damping resistor is required
to efficiently
component and may function
capability which might
will be
necessary. For
III.
or more information
please refer to
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Module Application Notes
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2.1.5 Antenna
Compliance
Compatible Model: Gmm-r1
GPS antenna is a receiving
part of the
would be ceramic patch antenna
of antennas, passive and active.
Passive antenna is solely antenna
antenna and chip antenna.
If you have your own patch antenna, it is required to get it fine tuned for
the specific module model to obtain the best possible signal strength.
External antenna is
a standalone device integrates
higher gain and better
performance
Antenna can be chosen according to radiation efficiency, radiation pattern, gain, bandwidth, form
factor and cost. Make sure the ground plane is
Design Patch antenna with GP module.
(1) In general, a 50Ω p
atch antenna will work
to the Antenna IN pin with
a
(2) Pleases keep
the patch antenna
high speed digital logics
and
(3) The 50Ω trace should be kep
t
noise from air and PCB.
A simple direct
(4) If needed, a matching
circuit could be place
matching circuit design
should be discuss
(5) For 50 Ω matching, please
refer to
PCB
trace
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.
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Module Application Notes
(MT3337 series)
Compliance
Design
part of the
device to acquire weak GPS sign
al from sky. Popular solution
would be ceramic patch antenna
because of
its small form factor with low cost. There are two types
Passive antenna is solely antenna
by itself without signal amplifier suc
h as LNA. Examples are p
If you have your own patch antenna, it is required to get it fine tuned for
the specific module model to obtain the best possible signal strength.
a standalone device integrates
with LNA
and patch antenna with a RF cable for
performance
than that of passive antenna.
Antenna can be chosen according to radiation efficiency, radiation pattern, gain, bandwidth, form
factor and cost. Make sure the ground plane is
sufficient for the antenna
for better
Design Patch antenna with GP module.
atch antenna will work
well with GPS module.
The antenna can be connected
a
50Ω impedance trace.
the patch antenna
far away from noise source such as switch
ing
and
radar wave guide.
t
as short as possible to reduce the chance
of being
A simple direct
-line trace is most recommended.
circuit could be place
d between patch antenna and
GPS
should be discuss
ed with the module and patch a
ntenna maker.
refer to
“50 Ω Antenna Matching” in Appendix II
.
trace
design for antenna impedance matching
RF Trace 50
Ω
10
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al from sky. Popular solution
its small form factor with low cost. There are two types
h as LNA. Examples are p
atch
If you have your own patch antenna, it is required to get it fine tuned for
and patch antenna with a RF cable for
Antenna can be chosen according to radiation efficiency, radiation pattern, gain, bandwidth, form
for better
performance.
The antenna can be connected
ing
power supply and
of being
picking up the
GPS
module. The
ntenna maker.
.
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Module Application Notes
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elect External Antennal
architecture
For an external antenna, it
needs
A typical method
is to feed a DC into the RF trace and the External Antenna
trace. Thus we can use the
RF trace to transport both
We use a RF chock coil to
couple
In GTOP module, we applied 3
kinds
Please select the module carefully while
•Mode1 (ex. Not D
efinition
externally feed into
pin VANT
coil. See Figure Mode 1.
•Mode2 (ex.
Gmm
GmmGmm
Gmm-
--
-r1
r1r1
r1
)
, the power supply needs to be externally provided and
directly to the
External A
Note: Chock Coil
for reference
•Mode3 (ex. Not D
efinition
circuit to
monitor the status
protection). Typically
, the current is limited if current >30mA.
The circuit also auto switch RF signal from internal Patch Antenna to External Antenna when
connect an
External Antenna.
Module
Mode
Mode
1
(Internal chock coil)
Mode
2
(External chock coil)
Mode
3
(Built-in Antenna S
upervisor)
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.
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Module Application Notes
(MT3337 series)
architecture
with GP module.
needs
a DC power to have it work properly.
is to feed a DC into the RF trace and the External Antenna
extracts the
RF trace to transport both
RF signal and DC power.
couple
the DC power to RF trace to
perform the mentioned method.
kinds
of architectures in our related module.
Please select the module carefully while
applying the design with an External A
ntenna.
efinition
), the power supply for the External A
ntenna needs to be
pin VANT
of the module and connect to Antenna
IN via a internal chock
, the power supply needs to be externally provided and
External A
ntenna via chock coil. See Figure Mode 2.
for reference
: LQG15HS33NJ02D (Murata)
efinition
), the power supply comes from VCC via an
antenna supervise
monitor the status
of DC current and limit the supplied
current (
, the current is limited if current >30mA.
The circuit also auto switch RF signal from internal Patch Antenna to External Antenna when
External Antenna.
See Figure Mode 3.
Module
Not Definition
Gmm-r1
upervisor)
11
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extracts the
DC from RF
perform the mentioned method.
ntenna.
ntenna needs to be
IN via a internal chock
, the power supply needs to be externally provided and
is connected
antenna supervise
current (
over current
The circuit also auto switch RF signal from internal Patch Antenna to External Antenna when
Not Definition
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Module Application Notes
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External Antenna
Figure
ExternalAntenna
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.
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Module Application Notes
(MT3337 series)
Module
Antenna_IN
VANT
RF
External Antenna
Antenna
Power
Figure Mode 1 (Internal chock coil)
Figure Mode 2 (External chock coil)
Figure
Mode 3 (Built-in Antenna Supervisor)
Module
MainPower
EX_ANT
ExternalAntenna
VCC
Antenna
advisorcircuit
12
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Module Application Notes
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2.1.6 1PP
Compatible Model: Gmm-
r1, PA6C
1PPS signal is an output pulse signal
Low Voltage level: 0~0.4V
High Voltage level: 2.8~3.1V
Period: 1s
Accuracy (jitter):±10ns
100ms pulse width duration (Firmware customization for
1PPS s
ignal
Free run 1PP output before 3D_FIX
GlobalTop
standard GPS module outputs 1PPS signal after the module obtained 3D_FIX. This is a
factory default setting.
For an always 1PPS signal output configuration,
customer via firmware customization service
the 1PPS is a free run and will lock until GPS 3D_Fix
Cable delay compensation
In some cases a long distance connection (~300m
cable length is critical.
For more information on 1PPS
signal
Delay caused by the cable length could be
that is useful for your implementation.
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.
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Module Application Notes
(MT3337 series)
r1, PA6C
-R
1PPS signal is an output pulse signal
used for timing application. Its electrical
characteristic
100ms pulse width duration (Firmware customization for
customized
pulse width is available)
ignal
and its pulse width with 100ms duration
Free run 1PP output before 3D_FIX
standard GPS module outputs 1PPS signal after the module obtained 3D_FIX. This is a
For an always 1PPS signal output configuration,
regard
less of 3D_Fix or not, this is
customer via firmware customization service
. Please be noted
that the accuracy before 3D_Fix on
the 1PPS is a free run and will lock until GPS 3D_Fix
.
In some cases a long distance connection (~300m
) may be needed. For
a timing application, the
signal
transmission delay please refer to
Appendix V
Delay caused by the cable length could be
compensat
ed with firmware setting. Please contact us if
that is useful for your implementation.
13
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characteristic
s are:
pulse width is available)
standard GPS module outputs 1PPS signal after the module obtained 3D_FIX. This is a
less of 3D_Fix or not, this is
available to our
that the accuracy before 3D_Fix on
a timing application, the
Appendix V
.
ed with firmware setting. Please contact us if
T
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
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GP
Module Application Notes
GlobalTop Technology
LED indicator for 1PP signal
For 1PPS LED indication, user may
2.1.7 3D_Fix
Compatible Model: Gmm-
r1, PA6C
3D_Fix signal is an output pulse signal
Low Voltage
High Voltage
Source current
ignal output before 2D Fix:
Duration: 1 second high and 1 second low.
Period: 2s
(Firmware customizable)
ignal output after 2D or 3D
Fix:
Duration: C
onstant low level output
(Firmware customizable)
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prior permission of GlobalTop Tech Inc
.
Specifications subject to change without prior notice.
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Module Application Notes
(MT3337 series)
For 1PPS LED indication, user may
connect
a LED indicator with a 330ohm resistor in series.
1PPS signal design for IO
r1, PA6C
-R
3D_Fix signal is an output pulse signal
used for GPS fix application. Its electrical
characteristic
Low Voltage
level: 0~0.4V
High Voltage
level: 2.8~3.1V
Source current
(Max.): 14mA, sink current 14mA
Duration: 1 second high and 1 second low.
Fix:
onstant low level output
14
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Ver. A0
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a LED indicator with a 330ohm resistor in series.
characteristic
s are:
T
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
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GP
Module Application Notes
GlobalTop Technology
For 3D_Fix indication, user may
in the two figures below.
(LED ON when low, LED OFF when high)
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prior permission of GlobalTop Tech Inc
.
Specifications subject to change without prior notice.
201
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GlobalTop Technology Inc. All Rights Reserved.
Module Application Notes
(MT3337 series)
For 3D_Fix indication, user may
connect
a LED with a 330ohm resister in series in two ways showing
3D_Fix signal design for IO
(LED ON when high, LED OFF when low)
3D_Fix signal design for IO
(LED ON when low, LED OFF when high)
15
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format without
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a LED with a 330ohm resister in series in two ways showing
T
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Module Application Notes
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2.2 Layout Guideline
Please follow the layout
guideline
2.2.1 Layout underneath
the GP module
Compatible Model: Gmm-r1
GPS signal is very weak signal level
decrease the quality of GPS.
In modern GPS product,
digital and RF system (BT, Wi
-
please don’t place any trace
under
clean GND plane is
highly recommended
For module PA6C-R
Place a hole according to th
e location of RF feeding pin of the
an area to fit the RF feeding
pin
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
prior permission of GlobalTop Tech Inc
.
Specifications subject to change without prior notice.
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GlobalTop Technology Inc. All Rights Reserved.
Module Application Notes
(MT3337 series)
2.2 Layout Guideline
guideline
for the right GPS module when design.
the GP module
GPS signal is very weak signal level
around -
160dBm~130dBm. Any noise or
In modern GPS product,
many include
LCD, MCU, High Speed
-
Fi, DVB-T…). In order to minimize the noise
interference
under
neath the GPS module. In other word
, give GPS module a
highly recommended
.
GPS Module on a clean GND plane
e location of RF feeding pin of the
module. The hole will
pin
on your system PCB and provide the
appropriate
16
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160dBm~130dBm. Any noise or
harmonic will
LCD, MCU, High Speed
interference
,
, give GPS module a
module. The hole will
provide
appropriate
hole size.
T
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prior permission of GlobalTop Tech Inc
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Module Application Notes
GlobalTop Technology
GPS on a
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
prior permission of GlobalTop Tech Inc
.
Specifications subject to change without prior notice.
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Module Application Notes
(MT3337 series)
GPS on a
clean GND plane and antenna hole
17
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format without
Specifications subject to change without prior notice.
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T
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
prior permission of GlobalTop Tech Inc
Copyright ©
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Module Application Notes
GlobalTop Technology
2.2.2
Keep far away from high profile or metal canned components
Compatible Model: PA6C-R
It is good practice to place
GPS
metal case enclosed components such as E
can be affected and pattern distortion can happen. At the wors
up to ~10dB.
2.2.3 Placement
Compatible Model: PA6C-R
Place the decoupling capacitors
Place the damping resistors
for TX/RX
Do not place:
GPS module in
proximity
GPS module in
proximity
GPS module in
proximity
Patch Antenna close to the
high profile metal case component
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
prior permission of GlobalTop Tech Inc
.
Specifications subject to change without prior notice.
201
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GlobalTop Technology Inc. All Rights Reserved.
Module Application Notes
(MT3337 series)
Keep far away from high profile or metal canned components
GPS
module far away from any high profile
component
metal case enclosed components such as E
-CAP, Coin battery, Pin Header.
The Antenna field pattern
can be affected and pattern distortion can happen. At the wors
t
case it will decrease the
Place the decoupling capacitors
for VCC close to GPS module.
for TX/RX
close to GPS module.
proximity
to high-speed digital processing circuitry
proximity
to high-current switching power circuitry
proximity
to clock sources circuitry
high profile metal case component
as 2.2.2 said.
18
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Keep far away from high profile or metal canned components
component
especially with
The Antenna field pattern
case it will decrease the
GPS signal
T
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
prior permission of GlobalTop Tech Inc
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Module Application Notes
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2.2.4 Trace
Compatible Model: Gmm-
r1, PA6C
(1) The USB differential
signals should be
and minimum radiation.
(2) Apply 50 ohm impendence
RF trace
(3) Any right angle turn in a
trace routing should be
It is better to have independent trace
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
prior permission of GlobalTop Tech Inc
.
Specifications subject to change without prior notice.
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GlobalTop Technology Inc. All Rights Reserved.
Module Application Notes
(MT3337 series)
r1, PA6C
-R
signals should be
trace closely and of equal length for
better
RF trace
for correct impedance matching.
trace routing should be
done
with two 135 degree turn o
It is better to have independent trace
of power source for any device
1
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better
noise immunity
with two 135 degree turn o
r an arc turn.
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Module Application Notes
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2.2.5
Ground egmentation
Compatible Model: Gmm-
r1, PA6C
In general, t
he separation of ground between G
recommended to avoid interference. If this is not possible, it is best to follow these typical rules:
segmentation of ground between digital and analogue system, high current and low current system,
and different radiation systems
such as G
digital and noise component at one corner of the board, while placing analog and quiet components
at the opposite corner of the board. Make sure there is no crossing of microstrip
the two component sets with g
round of each sets
Another way to do this is to
place the two different sets at different layer
grou
nd of each layer is contacted at
board.
2.2.6 Ground Plane
Compatible Model: PA6C-R
For module
a large GND plane directly
line of the antenna for better G
P
strongly recommended to have a ground plane designed underneath the
possible.
T
he recommended thickness for the ground layer is 0.5 to 1 OZ (0.0175 to 0.035 mm)
place the gr
ound plane on the top layer of the PCB, directly underneath the
the figure below.
his document is the exclusive property of GlobalTop Tech Inc. and should not be distributed, reproduced, into any other
prior permission of GlobalTop Tech Inc
.
Specifications subject to change without prior notice.
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GlobalTop Technology Inc. All Rights Reserved.
Module Application Notes
(MT3337 series)
Ground egmentation
r1, PA6C
-R
he separation of ground between G
PS
module and the rest of the system is
recommended to avoid interference. If this is not possible, it is best to follow these typical rules:
segmentation of ground between digital and analogue system, high current and low current system,
such as G
PS and GPRS. O
ne way to segment the ground is to place
digital and noise component at one corner of the board, while placing analog and quiet components
at the opposite corner of the board. Make sure there is no crossing of microstrip
round of each sets
to be contacted to
one point only.
place the two different sets at different layer
s
of the board, while the
nd of each layer is contacted at
one point only which is practically
located
a large GND plane directly
underneath the module could
enhance the magnetic
P
S signal reception.
Typically it will improve ~2dB maximum.
strongly recommended to have a ground plane designed underneath the
GPS
module
he recommended thickness for the ground layer is 0.5 to 1 OZ (0.0175 to 0.035 mm)
ound plane on the top layer of the PCB, directly underneath the
GPS
Ground Plane for FR4 Design
20
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module and the rest of the system is
recommended to avoid interference. If this is not possible, it is best to follow these typical rules:
segmentation of ground between digital and analogue system, high current and low current system,
ne way to segment the ground is to place
digital and noise component at one corner of the board, while placing analog and quiet components
at the opposite corner of the board. Make sure there is no crossing of microstrip
or current between
one point only.
of the board, while the
located
at the border of the
enhance the magnetic
-field
Typically it will improve ~2dB maximum.
It is
module
as big as
he recommended thickness for the ground layer is 0.5 to 1 OZ (0.0175 to 0.035 mm)
. It is best to
module as shown in
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