LG GW620 Building instructions
Service Manual Model : GW620
Internal Use Only
Service Manual
GW620
Date: November, 2009 / Issue 1.0
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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION...............................................5
1.1 Purpose......................................................................5
1.2 Regulatory Information.................................................5
2. PERFORMANCE............................................... 7
2.1 Product Name .............................................................7
2.2 Supporting Standard....................................................7
2.3 Main Parts : GSM Solution ...........................................7
2.4 HW Features ...............................................................8
2.5 SW Features .............................................................10
2.6. HW SPEC.................................................................12
3. Technical Brief .............................................18
3.1 GENERAL DESCRIPTION.............................................18
3.2 GSM MODE...............................................................20
3.3 UMTS MODE.............................................................24
3.4 LO GENERATION and DISTRIBUTION CIRCUIT ..............27
3.5 OFF-CHIP RF COMPONENTS......................................28
3.6 GPS MODE ...............................................................32
3.7 GPS/WIFI/BT OFF-CHIP RF COMPONENTS ..................33
3.8 FM Transceiver..........................................................36
3.9 Digital Baseband(DBB/MSM7200A)Q..........................38
3.10 Hardware Architecture .............................................39
3.11 Subsystem(MSM7200A) ..........................................43
3.12 Power Block............................................................46
3.13 External memory interface .......................................52
3.14 H/W Sub System .....................................................53
3.15 Audio and sound .....................................................67
3.16. Proximity Sensor.....................................................76
3.17. Luminance Sensor..................................................77
3.18. Motion Sensor........................................................78
3.19 Vibrators .................................................................79
3.20 Compass Sensor .....................................................80
3.21 Main Features.........................................................81
4. TROUBLE SHOOTING.....................................89
4.1 RF Component ..........................................................89
4.2 SIGNAL PATH ............................................................91
4.3 Checking TCXO Block ................................................95
4.4 Checking GSM TX Module(GSM PAM + FEM) Block.....97
4.5 Checking WCDMA Block ..........................................100
4.6 Checking GSM Block ...............................................112
4.7 GPS/WIFI/BT RF components ...................................120
4.8 GPS/WIFI/BT SIGNAL PATH ......................................122
4.9 GPS/WIFI/BT Trouble shooting ..................................124
4.10 Power ON Troubleshooting .....................................133
4.11 Charger Troubleshooting ........................................137
4.12. USB trouble..........................................................140
4.13. Audio troubleQ .....................................................143
4. 14. 5M Camera trouble..............................................153
4. 15. Main LCD trouble.................................................157
4.16 SIM Detect Troubleshooting....................................159
4.17 Side Key Troubleshooting .......................................161
4.18 VIBRATORS ...........................................................163
4.19. Proximity Sensor on/off trouble..............................164
4.20. Luminance Sensor on/off trouble...........................166
4.21. Motion Sensor on/off trouble .................................168
4.22. Compass Sensor on/off trouble..............................170
5. DOWNLOAD & S/W UPGRADE..................... 172
6. Block Diagram ...........................................197
7. CIRCUIT DIAGRAM...................................... 207
8. BGA Pin Map ..............................................219
9. PCB LAYOUT ...............................................225
10. Calibration & RF Auto Test Program
(Tachyon)..................................................233
11. Stand-alone Test......................................238
12. EXPLODED VIEW & REPLACEMENT
PART LIST ................................................251
12.1 EXPLODED VIEW ...................................................251
12.2 Replacement Parts ................................................253
12.3 Accessory .............................................................282
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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 5 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. INTRODUCTION
1.1. Purpose
This manual provides the information necessary to repair, calibration, description and download the
features of this model.
1.2. Regulatory Information
A. Security
Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example,
persons other than your company’s employees, agents, subcontractors, or person working on your
company’s behalf) can result in substantial additional charges for your telecommunications services.
System users are responsible for the security of own system.
There are may be risks of toll fraud associated with your telecommunications system. System users
are responsible for programming and configuring the equipment to prevent unauthorized use. The
manufacturer does not warrant that this product is immune from the above case but will prevent
unauthorized use of common carrier telecommunication service of facilities accessed through or
connected to it. The manufacturer will not be responsible for any charges that result from such
unauthorized use.
B. Incidence of Harm
If a telephone company determines that the equipment provided to customer is faulty and possibly
causing harm or interruption in service to the telephone network, it should disconnect telephone
service until repair can be done. A telephone company may temporarily disconnect service as long as
repair is not done.
C. Changes in Service
A local telephone company may make changes in its communications facilities or procedure. If these
changes could reasonably be expected to affect the use of the phones or compatibility with the net
work, the telephone company is required to give advanced written notice to the user, allowing the user
to take appropriate steps to maintain telephone service.
D. Maintenance Limitations
Maintenance limitations on the phones must be performed only by the manufacturer or its authorized
agent. The user may not make any changes and/or repairs expect as specifically noted in this manual.
Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system
and may void any remaining warranty.
E. Notice of Radiated Emissions
This model complies with rules regarding radiation and radio frequency emission as defined by local
regulatory agencies. In accordance with these agencies, you may be required to provide information
such as the following to the end user.
F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly
different.
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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1. INTRODUCTION
G. Interference and Attenuation
A phone may interfere with sensitive laboratory equipment, medical equipment, etc. Interference from
unsuppressed engines or electric motors may cause problems.
H. Electrostatic Sensitive Devices
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign. Following
information is ESD handling:
• Service personnel should ground themselves by using a wrist strap when exchange system boards.
• When repairs are made to a system board, they should spread the floor with anti-static mat which is
also grounded.
• Use a suitable, grounded soldering iron.
• Keep sensitive parts in these protective packages until these are used.
• When returning system boards or parts like EEPROM to the factory, use the protective package as
described.
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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. PERFORMANCE
2. PERFORMANCE
2.1 Product Name
GW620 : WCDMA900/2100+EGSM/GSM850/DCS/PCS
(HSDPA 7.2Mbps / HSUPA 2.0Mbps / GPRS Class 12 / EDGE Class 12)
2.2 Supporting Standard
Item Feature Comment
Supporting Standard WCDMA(FDD1,8)/EGSM/GSM850/DCS1800/PCS1
900 with seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1, 2, 3, C
Frequency Range WCDMA(FDD1) TX : 1920 – 1980 MHz
WCDMA(FDD1) RX : 2110 – 2170 MHz
WCDMA(FDD8) TX : 880 – 915 MHz
WCDMA(FDD8) RX : 925 – 960 MHz
EGSM TX : 880 – 915 MHz
EGSM RX : 925 – 960 MHz
GSM850 TX : 824 – 849 MHz
GSM850 RX : 869 – 894 MHz
DCS1800 TX : 1710 – 1785 MHz
DCS1800 RX : 1805 – 1880 MHz
PCS1900 TX : 1850 – 1910 MHz
PCS1900 RX : 1930 – 1990 MHz
Application Standard JAVA 2.0 But JAVA is not
supported for VDF and
BYT
2.3 Main Parts : GSM Solution
Item Part Name Comment
Digital Baseband MSM7200A : Qualcomm
Analog Baseband PM7540 : Qualcomm
RF Chip RTR6285 : Qualcomm
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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
2.4 HW Features
Item Feature Comment
Form Factor Slide slider(Qwerty) type
1) Capacity
Standard : Li-Ion polymer, 1500mAh
Battery
2) Packing Type : Soft Pack
Size Standard :
109 x 54.5 x 15.9mm
Weight 139g With Battery
Volume TBD
PCB 3-8 Staggered 10 Layers , 0.8t
Stand by time 2G Up to 350 hrs
3G Up to 350 hrs
@ Paging Period 9 (2G)
@ DRX 7 (3G)
Charging time 3 hrs @ Power Off / 1500mAh
Talk time 2G Up to 250mins
3G Up to 250 mins
@ Tx=Max(2G)
@ Tx = 12dBm (3G)
RX sensitivity WCDMA(FDD1) : -106.7 dBm
WCDMA(FDD8) : -103.7 dBm
EGSM : -105 dBm
GSM850 : -105 dBm
DCS 1800 : -105 dBm
PCS 1900 : -105 dBm
WCDMA/
GSM/
GPRS
WCDMA : 24dBm/3.84MHz,+1/-3dBm
EGSM :33dBm
GSM850 :33dBm
DCS 1800 : 30 dBm
PCS 1900 : 30 dBm
Class3(WCDMA)
Class4 (EGSM)
Class4 (GSM850)
Class1 (PCS)
Class1 (DCS)
TX output
power
EDGE GSM 900 : 27 dBm
DCS 1800 : 26 dBm
PCS 1900 : 26 dBm
E2 (GSM900)
E2 (PCS)
E2 (DCS)
GPRS compatibility GPRS Class 12
EDGE compatibility EDGE Class 12
SIM card type Plug-In SIM
3V /1.8V
Display Main LCD
TFT Main LCD(3’, 320 x 480)
Built-in Camera 5M CMOS Camera
Status Indicator No
Keypad Function Key : 3
Side Key : 2
Function Key:
CAM, Power, SNS
Side Key :
Volume up/down
ANT Main : Internal Fixed Type
System connector 5 Pin
Ear Phone Jack 3.5Phi, 4 Pole, Stereo
PC synchronization No
Memory NAND Flash : 4Gbit
SDRAM : 2Gbit
Speech coding FR, EFR, HR,AMR
Data & Fax Built in Data & Fax support
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Copyright © 2009 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
2. PERFORMANCE
Vibrator Built in Vibrator
Blue Tooth V2.1 + EDR
MIDI(for Buzzer
Function)
SW Decoded 72Poly
Music Player MP3/ WMA/AAC/HE-AAC/EAAC+
Video Player MPEG4, H.263, H.264, WMV9
Camcorder MPEG4, H.263,
Voice Recording Yes
Speaker Phone mode
Support
Yes
Travel Adapter Yes
CDROM Yes
Stereo Headset Yes
Data Cable Yes
T-Flash
(External Memory)
Yes
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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
2.5 SW Features
Item Feature Comment
RSSI 0 ~ 4 Levels
Battery Charging 0 ~ 6 Levels
Key Volume 0 ~ 7 Level
Audio Volume 1 ~ 15 Level
Time / Date Display Yes
Multi-Language Yes English/French/German/Spanish/Italia
n/Danish/Dutch/Korean
Quick Access Mode Dialing/ Contact / Menu / Message /
Camera
PC Sync No
Speed Dial No Voice mail center -> 1 key
Profile Yes not same with feature phone setting
CLIP / CLIR Yes
Phone Book Name / Number / Email / Chat Id/
Website/Postal
addresses/Organizations/Groups/
BirthdayNotes / Ringtone
There is no limitation on the number
of items.
It depends on
available memory amount.
Last Dial Number Yes Last Dial Numbers, Last Received
Numbers and Last Missed Numbers
can store up to a total of 500.
Last Received
Number
Yes Last Dial Numbers, Last Received
Numbers and Last Missed Numbers
can store up to a total of 500.
Last Missed Number Yes Last Dial Numbers, Last Received
Numbers and Last Missed Numbers
can store up to a total of 500.
Search by Number
/ Name
Name
Group Yes There is no limitation on the number
of items.
It depends on
available memory amount.
Fixed Dial Number Yes
Service Dial Number No
Own Number Yes Read only
(add/edit/delete are not
supported)
Voice Memo Yes Support voice recorder
Call Reminder No
Network Selection Automatic
Mute Yes
Call Divert Yes
Call Barring Yes
Call Charge (AoC) Yes
Call Duration Yes
SMS (EMS) There is no limitation on the
number of items.
It depends on available memory
amount.
EMS does not support.
SMS Over GPRS No
EMS Melody / Picture No
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Copyright © 2009 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
2. PERFORMANCE
Send / Receive / Save No
MMS MPEG4
Send / Receive / Save
Yes
Yes
Long Message MAX 459 characters SMS 3pages
Cell Broadcast Yes
Download Over the Web
Game Yes
Calendar Yes
Memo Yes There is no limitation on the number
of items.
It depends on available memory
amount.
World Clock No
Unit Convert No
Stop Watch No
Wall Paper Yes
WAP Browser No Support only web browser based on
webkit. WAP stack and wml are not
supported.
Download Melody /
Wallpaper
Yes Over web browser
SIM Lock Yes Operator Dependent
SIM Toolkit Class 1, 2, 3, C
MMS Yes Google MMS Client
EONS Yes
CPHS Yes V4.2
ENS No
Camera Yes 5M AF /
Digital Zoom : x4
JAVA Yes CLDC V1.1 / MIDP V2.1
Download Over Web
But JAVA is not supported for VDF
and BYT
Voice Dial No
IrDa No
Bluetooth Yes Ver. 2.1+EDR
(HSP,HFP,A2DP,AVRCP)
FM radio Yes
GPRS Yes Class 12
EDGE Yes Class 12
Hold / Retrieve Yes
Conference Call Yes Max. 6
DTMF Yes
Memo pad No
TTY No
AMR Yes
SyncML Yes
IM Yes
Email Yes
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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
2.6. HW SPEC.
1) GSM transceiver specification
Item Specification
Phase Error Rms:5°
Peak:20°
Frequency Error GSM : 0.1 ppm
DCS/PCS : 0.1 ppm
EMC(Radiated Spurious Emission
Disturbance) GSM/DCS:<-28dBm
T
ransmitter Output power and Burst
Timing
GSM : 5dBm – 33dBm ± 3dB
DCS/PCS : 0dBm – 30dBm ± 3dB
Burst Timing <3.69us
Spectrum due to modulation out to
less than 1800kHz offset
200kHz : -36dBm
600kHz : -51dBm/-56dBm
Spectrum due to modulation out to
larger than 1800kHz offset to the
edge of the transmit band
GSM:
1800-3000kHz :< -63dBc(-46dBm)
3000kHz-6000kHz : <-65dBc(-46dBm)
6000kHz < : < -71dBc(-46dBm)
DCS:
1800-3000kHz :< -65dBc(-51dBm)
6000kHz < : < -73dBc(-51dBm)
Spectrum due to switching transient 400kHz : -19dBm/-22dBm(5/0), -23dBm
600kHz : -21dBm/-24dBm(5/0), -26dBm
Reference Sensitivity – TCH/FS Class II(RBER) : -105dBm(2.439%)
Usable receiver input level range 0.012(-15 - -40dBm)
Intermodulation rejection – Speech
channels
± 800kHz, ± 1600kHz
: -98dBm/-96dBm (2.439%)
AM Suppression
GSM : -31dBm
- DCS : -29dBm
-98dBm/-96dBm (2.439%)
Timing Advance ± 0.5T
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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. PERFORMANCE
2) WCDMA transmitter specification
Item Specification
Transmit Frequency Band1 : 1920 MHz ~ 1980 MHz
Band8 : 880MHz~915MHz
Maximum Output Power +24 dBm / 3.84 MHz, +1 / -3 dB
Frequency Error within ±0.1 PPM
Open Loop Power Control Normal Conditions : within ±9 dB,
Extreme Conditions : within ±12 dB
Minimum Transmit Power < -50 dBm /3.84 MHz
Occupied Bandwidth < 5 MHz at 3.84 Mcps (99% of power)
Adjacent Channel Leakage
Power Ratio (ACLR)
> 33 dB @ ±5 MHz,
> 43 dB @ ±10 MHz
Spurious Emissions
|f-fc| > 12.5 MHz
< -36 dBm / 1 kHz RW @ 9 kHz ≤ f < 150 kHz
< -36 dBm / 10 kHz RW @ 150 KHz ≤ f < 30 MHz
< -36 dBm / 100 kHz RW @ 30 MHz ≤ f < 1 GHz
< -30 dBm / 1 MHz RW @ 1 GHz ≤ f < 12.75 GHz
< -60 dBm / 3.84 MHz RW @ 869 MHz ≤ f ≤ 894 MHz
< -60 dBm / 3.84 MHz RW @ 1930 MHz ≤ f ≤ 1900 MHz
< -60 dBm / 3.84 MHz RW @ 2110 MHz ≤ f ≤ 2155 MHz
< -67 dBm / 100 kHz RW @ 925 MHz ≤ f ≤ 935 MHz
< -79 dBm / 100 kHz RW @ 935 MHz < f ≤ 960 GHz
< -71 dBm / 100 kHz RW @ 1805 MHz ≤ f ≤ 1880 MHz
< -41 dBm / 300 kHz RW @ 1884.5 MHz < f < 1919.6 MHz
Transmit Intermodulation < -31 dBc @ 5 MHz & < -41 dBc @ 10 MHz
when Interference CW Signal Level = -40 dBc
Error Vector Magnitude < 17.5 %, when Pout ≥ -20 dBm
Peak Code Domain Error < -15 dB at Pout t-20 dBm
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Only for training and service purposes
2. PERFORMANCE
3) WCDMA receiver specification
Item Specification
Receive Frequency Band1 : 2110 ~ 2170 MHz
Band8 : 925~960MHz
Reference Sensitivity Level Band1 : BER < 0.001 when Îor = -106.7 dBm / 3.84 MHz
Band8 : BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz
Maximum Input Level BER < 0.001 when Îor = -25 dBm / 3.84 MHz
Adjacent Channel Selectivity
(ACS)
ACS > 33 dB where BER < 0.001 when
Îor = -92.7 dBm / 3.84 MHz
& Ioac = –52 dBm / 3.84 MHz @ ±5 MHz
Blocking Characteristic BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz
& Iblocking = -56 dBm / 3.84 MHz @ Fuw(offset) = ±10 MHz
or Iblocking = -44 dBm / 3.84 MHz @ Fuw(offset) = ±15 MHz
Spurious Response BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz
& Iblocking = -44 dBm
Intermodulation BER < 0.001 when Îor= -103.7 dBm / 3.84 MHz
& Iouw1 = -46 dBm @ Fuw1(offset) = ±10 MHz
& Iouw2 = -46 dBm / 3.84 MHz @ Fuw2(offset) = ±20 MHz
Spurious Emissions < -57 dBm / 100 kHz BW @ 9 kHz ≤ f < 1 GHz
< -47 dBm / 1 MHz BW @ 1 GHz ≤ f ≤ 12.75 GHz
Inner Loop Power Control
In Uplink
Adjust output(TPC command)
cmd 1dB 2dB 3dB
+1 +0.5/1.5 +1/3 +1.5/4
0 -0.5/+0.5 -0.5/+0.5 -0.5/+0.5
-1 -0.5/-1.5 -1/-3 -1.5/-4
group(10equal command group)
+1 +8/+12 +16/+24
- 15 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
2. PERFORMANCE
4) HSDPA transmitter specification
Item Specification
Transmit Frequency Band1 : 1920 MHz ~ 1980 MHz
Band8 : 880MHz~915 MHz
Maximum Output Power Sub-Test
1=1/15, 2=12/15 21~25dBm / 3.84 MHz
3=13/15 4=15/8 20~25dBm / 3.84 MHz
5=15/7 6=15/0 19~25dBm/3.84MHz
HS-DPCCH
Sub-test
in table
C.10.1.4
Power
step
Power step slot
boundary
Power
step size,
P [dB]
Transmitter power
step tolerance [dB]
1 Start of
Ack/Nack
6 +/- 2.3
2 Start of CQI 1 +/- 0.6
5
3 Middle of CQI 0 +/- 0.6
Spectrum Emission Mask
Sub-Test : 1=1/15, 2=12/15, 3=13/15, 4=15/8, 5=15/7, 6=15/0
Frequency offset
from carrier f Minimum requirement Measurement
Bandwidth
2.5 ~ 3.5 MHz -35-15×(f-2.5)dBc 30 kHz
3.5 ~ 7.5 MHz -35-1×(f-3.5)dBc 1 MHz
7.5 ~ 8.5 MHz -35-10×(f-7.5)dBc 1 MHz
8.5 ~ 12.5 MHz -49dBc 1 MHz
Adjacent Channel Leakage
Power Ratio (ACLR)
Sub-Test : 1=1/15, 2=12/15, 3=13/15, 4=15/8, 5=15/7, 6=15/0
> 33 dB @ ±5 MHz
> 43 dB @ ±10 MHz
Error Vector Magnitude < 17.5 %, when Pout ≥ -20 dBm
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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
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2. PERFORMANCE
5) HSDPA receiver specification
Item Specification
Receive Frequency
Band1 : 2110 ~ 2170 MHz
Band8 : 925 ~ 960Hz
Maximum Input Level
(BLER or R), 16QAM Only
Sub-Test : 1=1/15, 2=12/15, 3=13/15, 4=15/8, 5=15/7, 6=15/0
BLER < 10% or R >= 700kbps
6) WLAN 802.11b transceiver specification
Item Specification
Transmit Frequency 2400 MHz ~ 2483.5 MHz ( CH1~CH13 )
Tx Power Level ≤ 20dBm under (Europe), ≤ 30dBm under (USA)
Frequency Tolerance within ±25 PPM
Chip clock Frequency
Tolerance
within ±25 PPM
Spectrum Mask ≤ -30 @ fc-22MHz< f <fc-11MHz and fc+11MHz< f <fc+22MHz
≤ -50 @ f < fc-22MHz and f > fc+22MHz
Power ramp on/off time ≤ 2us
Carrier Suppression ≤ -15dB
Modulation Accuracy
(Peak EVM)
≤ 35%
Spurious Emissions < -36 dBm @ 30MHz ~ 1GHz
< -30 dBm above @ 1GHz ~ 12.75GHz
< -47 dBm @ 1.8GHz ~ 1.9GHz
< -47 dBm @ 5.15GHz ~ 5.3GHz
Rx Min input Sensitivity ≤ -76dBm(1Mbps,2Mbps,5.5Mbps,11Mbps) @ FER ≤ 8%
Rx Max input Sensitivity ≥ -10dBm(1Mbps,2Mbps,5.5Mbps,11Mbps) @ FER ≤ 8%
Rx Adjacent Channel
Rejection
≥ 35dB @FER ≤ 8%,
interference input signal -70dBm@fc±25MHz(11Mbps)
- 17 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
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2. PERFORMANCE
7) WLAN 802.11g transceiver specification
Item Specification
Transmit Frequency 2400 MHz ~ 2483.5 MHz ( CH1~CH13 )
Tx Power Level ≤ 20dBm under (Europe), ≤ 30dBm under (USA)
Frequency Tolerance within ±25 PPM
Chip clock Frequency
Tolerance
within ±25 PPM
Spectrum Mask ≤ -20 @ ±11MHz offset (9Mhz ~ 11MHz)
≤ -28 @ ±20MHz offset (11MHz ~ 20Mhz)
≤ -40 @ ±30MHz offset (20MHz ~ 30Mhz)
Transmitter constellation error
(rms EVM)
≤ -5dB
Spurious Emissions < -36 dBm @ 30MHz ~ 1GHz
< -30 dBm above @ 1GHz ~ 12.75GHz
< -47 dBm @ 1.8GHz ~ 1.9GHz
< -47 dBm @ 5.15GHz ~ 5.3GHz
Rx Min input Sensitivity PER ≤ 10%
-82dBm@6Mbps, -81dBm@9Mbps, -79dBm@12Mbps
-77dBm@18Mbps, -74dBm@24Mbps, -70dBm@36Mbps
-66dBm@48Mbps, -65dBm@54Mbps
Rx Max input Sensitivity ≥ -20dBm(6,9,12,18,24,36,48,54Mbps) @ PER ≤ 10%
Rx Adjacent Channel
Rejection
PER ≤ 10%,
ACR ≥ 16dB@6Mbps, ACR ≥ 15dB@9Mbps,
ACR ≥ 13dB@12Mbps, ACR ≥ 11dB@18Mbps,
ACR ≥ 8dB@24Mbps, ACR ≥ 4dB@36Mbps
ACR ≥ 0dB@48Mbps, ACR ≥ -1dB@54Mbps
ACR shall be measured by setting the desired signal's strength 3
dB above the rate-dependent
sensitivity specified in min input sensitivity
8) GPS receiver specification
Item Specification
Receive Frequency 1574.42 MHz ~ 1576.42 MHz
Minimum Sensitivity 1 satellite ≥-142dBm, 7 satellites ≥ -147dBm at coarse time aiding
- 18 -
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3. Technical Brief
3. Technical Brief
3.1 GENERAL DESCRIPTION
The GW620 supports UMTS-900(Band VIII), UMTS-2100(Band I), GSM-850, GSM-900, GSM-1800, and GSM-
1900 based GSM/GPRS/EDGE/UMTS. All receivers and the UMTS transmitter use the radioOne1Zero-IF
architecture to eliminate intermediate frequencies, directly converting signals between RF and baseband.
The quad-band GSM transmitters use a baseband-to-IF up-conversion followed by an offset phase-locked
loop that translates the GMSK-modulated or 8-PSK-modulated signal to RF.
[Figure -1] Block diagram of RF part
1 QUALCOMM’s branded chipset that implements a Zero-IF radio architecture.
- 19 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
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LGE Internal Use Only
3. Technical Brief
A generic, high-level functional block diagram of GW620 is shown in Figure 1-1. One antenna collects base
station forward link signals and radiates handset reverse link signals. The antenna connects with receive and
transmit paths through Sky77521 (FEM, Front End Module,Sky77521 include FEM and GSM PAM). The UMTS
receive paths each include an LNA, an RF band-pass filter, and a down converter that translate the signal
directly from RF-to-baseband using radioOne ZIF techniques. The RFIC’s RX analog baseband outputs, for the
receive chains, connect to the MSM IC. The UMTS and GSM RX baseband outputs share the same inputs to
the MSM IC.
For the transmit chains, the RTR6285 IC directly translates the TX baseband signals (from the MSM device) to
an RF signal using an internal LO generated by integrated on-chip PLL and VCO. The RTR6285 IC outputs
deliver fairly high-level RF signals that are first filtered by TX SAWs and then amplified by their respective
UMTS PAs.
In the GSM receive path, the received RF signals are applied through their band-pass filters and down-
converted directly to baseband in the RTR6285 transceiver IC. These baseband outputs are shared with the
UMTS receiver and routed to the MSM IC for further signal processing.
The GSM/EDGE transmit path employs one stage of up-conversion and, in order to improve efficiency, is
divided into phase and amplitude components to produce an open-loop Polar topology:
1. The on-chip quadrature up-converter translates the GMSK-modulated signal or 8-PSK modulated signal, to
a constant envelope phase signal at RF;
2. The amplitude-modulated (AM) component is applied to the ramping control pin of Polar power amplifier
from a DAC within the MSM
GW620 power supply voltages are managed and regulated by the PM7540 Power Management IC. This
versatile device integrates all wireless handset power management, general housekeeping, and user
interface support functions into a single mixed signal IC. It monitors and controls the external power source
and coordinates battery recharging while maintaining the handset supply voltages using low dropout,
programmable regulators.
The device’s general housekeeping functions include an ADC and analog multiplexer circuit for monitoring
on-chip voltage sources, charging status, and current flow, as well as user-defined off-chip variables such as
temperature, RF output power, and battery ID. Various oscillator, clock, and counter circuits support IC and
higher-level handset functions. Key parameters such as under-voltage lockout and crystal oscillator signal
presence are monitored to protect against detrimental conditions.
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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Technical Brief
3.2 GSM MODE
3.2.1 GSM RECEIVER
The GSM-850, GSM-900, GSM-1800, and GSM-1900 receiver inputs of RTR6285 are connected to the
transceiver front-end circuits(switch module) through saw filters. GSM-850, GSM-900, GSM-1800, and GSM-
1900 receiver inputs use differential configurations to improve common-mode rejection and second-order
non-linearity performance as shown in Figure 1-2. The balance between the complementary signals is critical
and must be maintained from the RF filter outputs all the way into the IC pins
[Figure 1-2] GSM Receiver Inputs Topologies
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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. Technical Brief
Since GSM-850, GSM-900, GSM-1800, and GSM-1900 signals are time-division duplex (the handset can only
receive or transmit at one time), switches are used to separate RX and TX signals in place of frequency
duplexers – this is accomplished in the switch module. The GSM-850, GSM-900, GSM-1800, and GSM-1900
receive signals are routed to the RTR6285 through saw filters and matching networks that transform single-
ended 50-Ω sources to differential impedances optimized for gain and noise figure. The RTR input uses a
differential configuration to improve second-order inter-modulation and common mode rejection
performance. The RTR6285 input stages include MSM-controlled gain adjustments that maximize receiver
dynamic range.
The amplifier outputs drive the RF ports of the quadrature RF-to-baseband downconverters. The
downconverted baseband outputs are multiplexed and routed to lowpass filters (one I and one Q) having
passband and stopband characteristics suitable for GMSK or 8-PSK processing. These filter circuits include DC
offset corrections. The filter outputs are buffered and passed on to the MSM7200A IC for further processing as
shown in Figure 1-3.
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