LG KF310 User manual
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1. INTRODUCTION .............................. 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
2. PERFORMANCE...............................7
2.1 Supporting Standard................................7
2.2 Main Parts : Solution................................7
2.3 HW Features............................................8
2.4 HW Spec. ..............................................10
3. TECHNICAL BRIEF ........................13
3.1 General Description ...............................13
3.2 GSM Mode.............................................15
3.3 UMTS Mode...........................................18
3.4 LO generation and distribution circuits...20
3.5 Off-chip RF Components .......................20
3.6 Digital Baseband (DBB/MSM6245)........29
3.7 Subsystem(MSM6245) ..........................31
3.8 Power Block...........................................39
3.9 External memory interface.....................44
3.10 H/W Sub System..................................46
4. TROUBLE SHOOTING ...................61
4.1 Power on trouble....................................61
4.2 USB trouble............................................64
4.3 SIM detect trouble..................................65
4.4 Key sense trouble ( KEYPAD ) ..............67
4.5 Keypad backlight trouble........................70
4.6 Micro SD trouble ....................................71
4.7 Audio trouble..........................................72
4.8 Camera trouble ......................................80
4.9 Main LCD trouble...................................83
4.10 Bluetooth trouble..................................86
4.11 RF Component.....................................88
4.12 SIGNAL PATH .....................................89
4.13 Checking VCTCXO Block ....................91
4.14 Checking Front-End Module Block ......93
4.15 Checking UMTS Block.........................95
4.16 Checking GSM Block...........................99
5. DOWNLOAD .................................105
5.1 Introduction ..........................................105
5.2 Downloading Procedure.......................105
5.3 Troubleshooting Download Errors .......120
5.4 Caution.................................................125
6. BLOCK DIAGRAM ........................126
6.1 GSM & UMTS RF Block.......................126
6.2 Interface Diagram ................................128
7. Circuit Diagram ............................131
8. BGM Pin Map................................139
9. PCB LAYOUT................................143
10. Calibration & RF Auto Test
(HOT KIMCHI) .............................149
10.1 Usage of Hot-Kimchi..........................149
11. EXPLODED VIEW &
REPLACEMENT PART LIST ......153
11.1 EXPLODED VIEW .............................153
11.2 Replacement Parts
<Mechanic component>.....................155
<Main component> ............................158
Table Of Contents
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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.
1. INTRODUCTION
1. INTRODUCTION
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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.
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.
1. INTRODUCTION
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2. PERFORMANCE
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2.1 Supporting Standard
2.2 Main Parts : Solution
2. PERFORMANCE
Item Feature Comment
Supporting Standard WCDMA
EGSM900/DCS1800/PCS1900 with
seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1, 2, 3, A-E
Frequency Range EGSM900 TX : 880 - 915 MHz
EGSM900 RX : 925 - 960 MHz
DCS1800 TX : 1710 - 1785 MHz
DCS1800 RX : 1805 - 1880 MHz
PCS1900 TX : 1850 - 1910 MHz
PCS1900 RX : 1930 - 1990 MHz
WCDMA2100 TX : 1920 - 1980 MHz
WCDMA2100 RX : 2110 - 2170 MHz
Application Standard WAP 2.0, JAVA 2.0
Item Part Name Comment
Digital Baseband MSM6245 (Qualcomm)
Analog Baseband MSM6245(Qualcomm)
RF Chip RTR6280(Qualcomm)
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2.3 HW Features
2. PERFORMANCE
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Item Feature Comment
Form Factor Slide type
Battery 1) Capacity
Standard : Li-Ion, 900mAh
2) Packaging Type : Soft Pack
Size 97 x 48 x 16.7 mm
Weight 95 g With Battery
Stand by GSM 230 hours @paging period 5
time WCDMA 230 hours @DRX=1.28
Talk time GSM 200min @ Power Level 7
WCDMA 200min @Tx=12dBm
Charging time 3 hours @power OFF/900mAh
Rx sensitivity EGSM900 : -105 dBm
DCS1800 : -105 dBm
PCS1900 : -105 dBm
WCDMA2100 : -106.7 dBm
EGSM900 : 33 dBm Class4 (EGSM900)
DCS1800 : 30 dBm Class1(DCS)
PCS1900 : 30 dBm Class1(PCS)
EGSM900 : 27 dBm E2 (EGSM900)
DCS1800 : 26 dBm E2 (DCS)
PCS1900 : 26 dBm E2 (PCS)
GPRS compatibility GPRS Class 12
EDGE compatibility EDGE Class 12
Display QCIF Main LCD(2”, 176 x 220)
Built-in Camera 2.0 Mega pixel + VGA Video Call Camera
ANT Main : Internal Fixed Type
System connector 18 Pin
Ear Phone Jack 18pin, 4 Pole, Stereo
TX output
power
GSM/
GPRS
EDGE
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2. PERFORMANCE
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Item Feature Comment
PC synchronization Yes
Speech coding FR, EFR, HR, AMR
Vibrator Built in Vibrator
Blue Tooth V1.2
Voice Recording Yes
Speaker Phone mode Yes
Support
Travel Adapter Yes
CDROM No
Stereo Headset Yes
Data Cable No
T-Flash Yes Not Equipped
(External Memory)
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2. PERFORMANCE
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2.4 HW Spec.
2.4.1. GSM Transmitter/Receiver spec.
Item Specification
Frequency EGSM900 TX : 880 - 915 MHz RX : 925 - 960 MHz
DCS1800 TX : 1710 - 1785 MHz RX : 1805 - 1880 MHz
PCS1900 TX : 1850 - 1910 MHz RX : 1930 - 1990 MHz
Phase Error Rms : 5°
Peak : 20°
Frequency Error GSM : 0.1 ppm
DCS/PCS : 0.1 ppm
EMC(Radiated Spurious GSM/DCS : < -28dBm
Emission Disturbance)
Transmitter Output power GSM : 5dBm - 33dBm 3dB
and Burst Timing DCS/PCS : 0dBm - 30dBm 3dB
Burst Timing <3.69us
Spectrum due to modulation 200kHz : -36dBm
out to less than 1800kHz offset 600kHz : -51dBm/-56dBm
Spectrum due to modulation GSM : 1800-3000kHz :< -63dBc(-46dBm)
out to larger than 3000kHz-6000kHz : <-65dBc(-46dBm)
1800kHz offset to the edge 6000kHz < : < -71dBc(-46dBm)
of the transmit band 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 - 800kHz, 1600kHz : -98dBm/-96dBm (2.439%)
Speech channels
AM Suppression -98dBm/-96dBm (2.439%)
- GSM : -31dBm - DCS : -29dBm
Timing Advance 0.5T
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2.4.2. WCDMA Transmitter spec.
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2. PERFORMANCE
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Item Specification
Transmit Frequency 1920 MHz ~ 1980 MHz
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 > 33 dB @ 5 MHz,
Power Ratio (ACLR) > 43 dB @ 10 MHz
Spurious Emissions < -36 dBm / 1 kHz RW @ 9 kHz ≤ f < 150 kHz
|f-fc| > 12.5 MHz < -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
< -41 dBm / 300 kHz RW @ 1893.5 MHz < f < 1919.6 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
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 ≥ -20 dBm
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2. PERFORMANCE
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2.4.3. WCDMA Receiver spec.
Item Specification
Receive Frequency 2110 ~ 2170 MHz
Reference Sensitivity Level BER < 0.001 when Îor = -106.7 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 / 3.84MHz
& 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 = -44dBm
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
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3. TECHNICAL BRIEF
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3.1 General Description
The KF310 supports UMTS-2100, EGSM-900, DCS-1800, and PCS-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 upconversion followed by an offset
phase-locked loop that translates the GMSK-modulated or 8-PSK-modulated signal to RF.
A generic, high-level functional block diagram of KF310 is shown in [Fig. 3.1]. One antenna collects
base station forward link signals and radiates handset reverse link signals. The antenna connects with
receive and transmit paths through a FEM(Front End Module).
3. TECHNICAL BRIEF
[Fig 3.1] Block diagram of RF part
1QUALCOMM’s branded chipset that implements a Zero-IF radio architecture.
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The UMTS receive paths each include an LNA, an RF band-pass filter, and a downconverter 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 RTR6280 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
RTR6280 IC outputs deliver fairly high-level RF signals that are first filtered by Tx SAWs and then
amplified by their respective UMTS PAs. The high- and low-band UMTS RF transmit signals emerge
from the RTR6280 transceiver.
In the GSM receive path, the received RF signals are applied through their band-pass filters and
down-converted directly to baseband in the RTR6280 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 upconverter 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
KF310 power supply voltages are managed and regulated by the PM6658 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 userdefined 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.
3. TECHNICAL BRIEF
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3.2 GSM Mode
3.2.1 GSM Receiver
The Dual-mode KF310’s receiver functions are operated by only one RFIC as follows:
■ EGSM-900, DCS-1800, PCS-1900 and UMTS-2100 modes use the RTR6280 IC only. Each mode
has independent front-end circuits and down-converters, but they share common baseband circuits
(with only one mode active at a time). All receiver control functions are beginning with SBI2 -
controlled parameters.
RF Front end consists of antenna, antenna switch module (DGM129M01) which includes three RX
saw filters (EGSM-900, DCS-1800 and PCS-1900). The antenna switch module allows multiple
operating bands and modes to share the same antenna. In KF310, a common antenna connects to
one of six paths: 1) UMTS-2100 Rx/Tx, 2) EGSM-900 Rx, 3) EGSM-900 Tx, 4) DCS-1800 Rx, and 5)
DCS-1800, PCS-1900 Tx(High Band Tx’s share the same path), 6) PCS-1900 Rx. UMTS operation
requires simultaneous reception and transmission, so the UMTS Rx/Tx connection is routed to a
duplexer that separates receive and transmit signals. GSM900, DCS1800, and PCS1900 operation is
time division duplexed, so only the receiver or transmitter is active at any time and a frequency
duplexer is not required.
The GSM900, DCS1800, and PCS1900 receiver inputs of RTR6280 are connected directly to the
transceiver front-end circuits(filters and antenna switch module). GSM900, DCS1800, and PCS1900
receiver inputs use differential configurations to improve common-mode rejection and second-order
non-linearity performance. The balance between the complementary signals is critical and must be
maintained from the RF filter outputs all the way into the IC pins. Since GSM900, DCS1800, and
PCS1900 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.
2The RFIC operating modes and circuit parameters are MSM-controlled through the proprietary 1-line Serial Bus Interface (SBI). The Application
Programming Interface (API) is used to implement SBI commands. The API is documented in AMSS Software - please see applicable AMSS
Software documentation for details.
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3. TECHNICAL BRIEF
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ANT_SEL0 ANT_SEL1 ANT_SEL2
GSM850/EGSM TX HIGH LOW HIGH
PCN/PCS TX HIGH HIGH LOW
WB2100 HIGH LOW LOW
EGSM RX LOW HIGH LOW
PCN RX LOW LOW HIGH
PCS RX LOW HIGH LOW
[Table 3.2.1] Antenna Switch Module Control logic
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The GSM900, DCS1800, and PCS1900 receive signals are routed to the RTR6280 band selection
filters and matching networks that transform single-ended 50Ω 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 RTR6280 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 MSM6245 IC
for further processing (an interface shared with the RFR6275 UMTS receiver outputs).
3. TECHNICAL BRIEF
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[Fig. 3.2.2] RTR6280 RX feature
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3. TECHNICAL BRIEF
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3.2.2 GSM Transmitter
The RTR6280 transmitter outputs(HB_RF_OUT2 and LB_RF_OUT1) include on-chip output matching
inductors. 50ohm output impedance is achieved by adding a series capacitor at the output pins. The
capacitor value may be optimized for specific applications and PCB characteristics based on pass-band
symmetry about the band center frequency. The suggested circuit is shown in [Fig. 1.3].
The RTR6280 IC is able to support EGSM900 and DCS1800/PCS1900 mode transmitting. This design
guideline shows a tri-band GSM application.
Both high-band and low band outputs are followed by resistive pads to ensure that the load Presented
to the outputs remains close to 50ohm. The low-band GSM. Tx path also includes a Tx-band SAW filter
to remove noise-spurious components and noise that would be amplified by the PA and appear in the
GSM Rx band.
[Fig. 3.2.3] GSM Transmitter matching
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3. TECHNICAL BRIEF
3.3 UMTS Mode
3.3.1 Receiver
The UMTS duplexer receiver output is routed to LNA circuits within the RTR6280 device. The UMTS
Rx input is provided with an on-chip LNA that amplifies the signal before a second stage filter that
provides differential downconverter. This second stage input is configured differentially to optimize
second-order intermodulation and common mode rejection performance. The gain of the UMTS
frontend amplifier and the UMTS second stage differential amplifier are adjustable, under MSM
control, to extend the dynamic range of the receivers. The second stage UMTS Rx amplifiers drive the
RF ports of the quadrature RF-tobaseband downconverters. The downconverted UMTS Rx baseband
outputs are routed to lowpass filters having passband and stopband characteristics suitable for UMTS
Rx processing. These filter circuits allow DC offset corrections, and their differential outputs are
buffered to interface shared with GSM Rx to the MSM IC. The UMTS baseband outputs are turned off
when the RTR6280 is downconverting GSM signals and on when the UMTS is operating.
3.3.2 Transmitter
The UMTS Tx path begins with differential baseband signals (I and Q) from the MSM device. These
analog input signals are amplified, filtered, and applied to the quadrature upconverter mixers. The
upconverter output is amplified by multiple variable gain stages that provide transmit AGC control. The
AGC output is filtered and applied to the driver amplifier; this output stage includes an integrated
matching inductor that simplifies the external matching network to a single series capacitor to achieve
the desired 50-Ω interface. The RTR6280 UMTS output is routed to its power amplifier through a
bandpass filter, and delivers fairly high-level signals that are filtered and applied to the PA. Transmit
power is delivered from the duplexer to the antenna through the switch module.
The transceiver LO synthesizer is contained within the RTR6280 IC with the exception of the off-chip
loop filter components and the VC-TCXO. This provides a simplified design for multimode applications.
The PLL circuits include a reference divider, phase detector, charge pump, feedback divider, and
digital logic generator.
UMTS Tx using only PLL1, the LO generation and distribution circuits create the necessary LO signals
for nine different frequency converters. The UMTS transmitter also employs the ZIF architecture to
translate the signal directly from baseband to RF. This requires FLO to equal FRF, and the RTR6280
IC design achieves this without allowing FVCO to equal FRF.
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3.4 LO generation and distribution circuits
The integrated LO generation and distribution circuits are driven by internal VCOs to support various
modes to yield highly flexible quadrature LO outputs that drive all GSM/EDGE and UMTS band
upconverters and downconverters; with the help of these LO generation and distribution circuits, true
zero-IF architecture is employed in all GSM and UMTS band receivers and transmitters to translate the
signal directly from RF to baseband and from baseband to RF.
Two fully functional fractional-N synthesizers, including VCOs and loop filters, are integrated within the
RTR6280 IC. The first synthesizer (PLL1) creates the transceiver LOs that support the UMTS 2100
transmitter, and all four GSM band receivers and transmitters including:
GSM900, DCS1800, and PCS1900. The second synthesizer (PLL2) provides the LO for the UMTS
2100 receiver. An external TCXO input signal is required to provide the synthesizer frequency
reference to which the PLL is phase and frequency locked. The RTR6280 IC integrates most of PLL
loop filter components on-chip except two off-chip loop filter series capacitors, and significantly
reduces off-chip component requirement. With the integrated fractional-N PLL synthesizers, the
RTR6280 has the advantages of more flexible loop bandwidth control, fast lock time, and low-
integrated phase error
3.5 Off-chip RF Components
3.5.1 UMTS PAM (U1004: ACPM-7381)
The UMTS PA output power is monitored by power detector circuits (U1000 : RTR6280).
This detector voltage can be used for transmitter calibration and monitor to meet RF system
specification.
3. TECHNICAL BRIEF
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[Fig. 3.4.1] UMTS PAM, Duplexer, Coupler
S21 : -7.2 dB
S11 : -42 dB
WCDMA
2.2u
C1089
C1093
120p
FL1002 B7643
ANT
GND1
GND2
GND3 GND4
GND5
GND6
RX
TX
1
IN
4
O1
SFSY0031101
EFCH1950TDF1
FL1003
2
G1
3
G2
G3
5
C1104
DNI
R1030
130
51
R1028
C1087 SCDY0003801
LDC151G8820Q-359
U1003
COU
3IN 2
OUT 1
TER
4
5.6p
NA
L1018
GND1
6GND2
7
9GND3
PGND
11
2
RFIN
RFOUT
8
1
VCC1VCC2
10
VEN 5
VMODE0 4
3
VMODE1
ACPM-7381 U1004
C1088
1.5nH
C1103
DNI
22p
C1096
1.8nH
R1026
R1029
130
2.2p
C1091
R1027
47
C1100
33p
C1094 0.01u
NA
L1017
C1099
1nH
C1092
0.01u
1nH
L1019
L1016 2.7nH
+VPWR
PDET_IN
PA_R0
WCDMA_RX_HB
W_TX_HB_OUT
PA_ON0
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3. TECHNICAL BRIEF
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3.5.2 VCTCXO (X1000 :DAS321SCE-19.2M)
The Voltage Controlled Temperature Compensated Crystal Oscillator (VCTCXO) provides the
reference frequency for all RFIC synthesizers as well as clock generation functions within the
MSM6245 IC. The oscillator frequency is controlled by the MSM6245 ICs. TRK_LO_ADJ pulse density
modulated signal in the same manner as the transmit gain control TX_AGC_ADJ. A two-pole RC
lowpass filter is recommended on this control line. The PM6658 IC controls the handset power-up
sequence, including a special VCTCXO warmup interval before other circuits are turned on. This
warm-up interval (as well as other TCXO controller functions) is enabled by the MSM TCXO_EN line .
The PM6658 IC VREG_TCXO regulated output voltage is used to power the VCTCXO and is enabled
before most other regulated outputs.
Any GSM mode power control circuits within the MSM6245 IC require a reference voltage for proper
operation and sufficient accuracy. Connecting the PM6658 IC REF_OUT directly to the MSM6275 IC
GSM_PA_PWR_CTL_REF provides this reference. This sensitive analog signal needs a 0.1 µF low
frequency filter near to MSM side, and isolate from digital logic and clock traces with ground on both
sides, plus ground above and below if routed on internal layers.
3.5.3 Front-End Module (FL1000 : DGM129M01)
This equipment uses a single antenna to support all handset operating modes, with an antenna switch
module select the operating frequency and band. UMTS operation requires simultaneous reception
and transmission, so the UMTS Rx/Tx connection is routed to a duplexer that separates receive and
transmit signals. The active connection is MSM-selected by three control lines (GPIO[9], GPIO[10],
and GPIO[11]). These GPIOs are programmed to be ANT_SEL0, ANT_SEL1, and ANT_SEL2
respectively.
ANT_SEL0 ANT_SEL1 ANT_SEL2
GSM850/EGSM TX HIGH LOW HIGH
PCN/PCS TX HIGH HIGH LOW
WB2100 HIGH LOW LOW
EGSM RX LOW HIGH LOW
PCN RX LOW LOW HIGH
PCS RX LOW HIGH LOW
[Table 3.5.3.1] Front End Module control logic
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