LG G7100 Service Manual page 69

4.3.7 Receiver and Transmitter RF Level
FAR-G6CS-1G8425-L250
②
-63 dBm
DCS : 1805 ~ 1880MHz
GSM : 925 ~ 960MHz
①
-62 dBm
GSMSEL
ANT
DCSSEL
S/W
LMSP54AA-097
⑧ ⑦
30 dBm 33 dBm
GSM : 880 ~ 925MHz
DCS : 1710 ~ 1785MHz
④
-65 dBm
0
4/3
90
-64 dBm
③
0
2/3
90
/3
DCS
GSM
f
TX
PAM(PF08122B)
⑤
8 dBm
⑥
6 dBm
TXVCO
TXRAMP
TXPA
BANDSEL1
CX74017
f vco = (N+3.5+FN/2^22 ) f ref/R
f
vco
/R
Fractional-N
LF
PLL
X2
f
LO
X2
f
IF
/D1
PFD
LF
/D2
- 71 -
4. TROUBLE SHOOTING
RXIP
RXIN
RXQP
RXQN
2V7_VTCXO
13MHz
f
ref
13MHz
AFC
REFCLK
Base
PLL_DATA
Serial
PLL_CLK
I/O Band
PLL_LE
Block
PLL_PD
Serial
RXEN
I/O
TXEN
FEENA
BANDSEL1
BANDSEL2
TXIP
TXIN
0
90
TXQP
TXQN