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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.5 Off-chip RF Components
3.5.1 UMTS PAM (U104: RF5184)
The UMTS PA output power is monitored by power detector circuits (U101 : RTR6280) .
This detector voltage can be used for transmitter calibration and monitor to meet RF system
specification.
3.5.2 VCTCXO (X101 : DSA321SCE-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 MSM6280 IC. The
oscillator frequency is controlled by the MSM6280 ICs. TRK_LO_ADJ pulse density modulated signal in
the same manner as the transmit gain control TX_AGC_ADJ. A two-pole RC low pass filter is
recommended on this control line.
The PM6658 IC controls the handset power-up sequence, including a special VCTCXO warm-up
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 MSM6280 IC require a reference voltage for proper
operation and sufficient accuracy. Connecting the PM6658 IC REF_OUT directly to the MSM6280 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.
- 24 -
2
4
5
3
1
KRX102EK
R
X
1
0
2
E
Q101Q
1
0
1
33p
33p
C194
C194
C178
C178
2200p
2200p
L123
L123
12nH
12nH
C189
C189
4.7u
4.7u
2
4
5
3
1
KRX102EK
R
X
1
0
2
E
Q102Q
1
0
2
L125
L125
1.5p
1.5p
C1006
C1006
1000p
1000p
4
LDC151G8820Q-359
LDC151G8820Q-359
U105
U105
COUC
O
U
3
ININ
2
OUTO
U
T
1
TERT
E
R
L124L
1
2
4
1.5nH1
.5
n
H
DNI
DNI
C197
C197
1p
1p
C195
C195
3.9nH3
.9
n
H
L127L
1
2
7
1nH
1nH
L131
L131
C1001
C1001
DNI
DNI
C188
C188
5.6p
5.6p
2200p
2200p
C1002
C1002
C177
C177
56p
56p
C199
C199
2.7nH
2.7nH
L120
L120
DNI
DNI
C180
C180
1.2p
1.2p
DNI
DNI
C181
C181
FL104
FL104
B7683
B7683
ANT
ANT
GND1
GND1
GND2
GND2
GND3
GND3
GND4
GND4
GND5
GND5
RX1
RX1
RX2
RX2
TX
TX
6
222
2
VCC1_PCSV
C
C
1
_
P
C
S
9
VCC2_CELL1V
C
C
2
_
C
E
L
L
1
VCC2_CELL2V
C
C
2
_
C
E
L
L
2
101
0
VCC2_CELL3V
C
C
2
_
C
E
L
L
3
111
1
VCC2_PCS1V
C
C
2
_
P
C
S
1
212
1
VCC2_PCS2V
C
C
2
_
P
C
S
2
202
0
191
9
VCC2_PCS3V
C
C
2
_
P
C
S
3
VCC_BIASV
C
C
_
B
IA
S
232
3
VMODE_CELL
VMODE_CELL
4
242
4
VMODE_PCSV
M
O
D
E
_
P
C
S
3
VREG_CELL
VREG_CELL
VREG_PCS
VREG_PCS
1
7
NC1N
C
1
NC2N
C
2
8
121
2
NC3N
C
3
NC4
NC4
13
13
NC5
NC5
15
15
17
17
NC6
NC6
NC7
NC7
18
18
PGNDP
G
N
D
252
5
5
RFIN_CELL
RFIN_CELL
2
RFIN_PCS
RFIN_PCS
14
14
RFOUT_CELL
RFOUT_CELL
16
16
RFOUT_PCS
RFOUT_PCS
VCC1_CELL
VCC1_CELL
U104
U104
RF5184
RF5184
L129L
1
2
9
2.7nH2
.7
n
H
R119R
1
1
9
33p
33p
515
1
C1004
C1004
FL105
FL105
EFCH836MTDB1
EFCH836MTDB1
2
G1
G1
3
G2
G2
G3
G3
5
IN
IN
1
4
O1
O1
828
2
R117R
1
1
7
GND5
GND5
GND6
GND6
RX
RX
TX
TX
FL106
FL106
B7646
B7646
ANT
ANT
GND1
GND1
GND2
GND2
GND3
GND3
GND4
GND4
18nH
18nH
L126
L126
12p1
2
p
C185C
1
8
5
1000p
1000p
C198
C198
L132
L132
1nH
1nH
U103
U103
COUC
O
U
3
ININ
2
OUTO
U
T
1
TERT
E
R
4
LDC15836M20Q-360
LDC15836M20Q-360
C187
C187
DNI
DNI
C196
C196
NA
NA
DNI
DNI
L122
L122
R116
R116
82
82
C1005
C1005
2200p
2200p
2200p
2200p
C186
C186
828
2
R118R
1
1
8
SAFEB1G95KA0F00
SAFEB1G95KA0F00
FL107
FL107
2
G1
G1
5
G2
G2
G3
G3
3
1
IN
IN
4
OUT
OUT
L128
L128
L130
L130
2.2nH
2.2nH
2.7nH
2.7nH
L121
L121
1.5p
1.5p
C1003
C1003
15p
15p
2.2nH
2.2nH
L133
L133
WCDMA_850_TX_OUT
WCDMA_850_TX_OUT
WCDMA_2100_TX_OUT
WCDMA_2100_TX_OUT
VREG_WCDMA_PA
VREG_WCDMA_PA
VREG_RF_2.85V
VREG_RF_2.85V
PA_ON0
PA_ON0
VREG_RF_2.85V
VREG_RF_2.85V
VREG_RF_2.85V
VREG_RF_2.85V
RX_WCDMA_2100
RX_WCDMA_2100
RX_WCDMA_850_P
RX_WCDMA_850_P
PA_ON1
PA_ON1
PDET_IN
PDET_IN
PWR_DET
PWR_DET
PWR_DET
PWR_DET
RX_WCDMA_850_M
RX_WCDMA_850_M
WCDMA_2100
WCDMA_2100
[Fig. 3.5] UMTS PAM, Duplexer, Coupler
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