LG KE820 Service Manual page 121

7. CIRCUIT DIAGRAM
1 2 3
A
B
ANT406 ANT405
1
C462
R440 R406
NA 0
10p
C
C406 L408
2.2p 2.7nH
GND405
D
E
R412
LBAND_PAM_IN
R413 0
HBAND_PAM_IN
0
R420 R421 R415 R416
NA NA NA NA
F
G
H
1 2 3
4 5 6
2V85_RF
C437
0.1u
SW401
KMS-506
GND11
26
C404
GND10
G2 25
ANT GND9
ANT RF
G1 1 24
GND8
100p
23
GND7
11
0.5p
C410
R452
0
R408
0
C412
NA
GSM850 GSM900 DCS1800 PCS1900
2V85_RF
C445 C446 C443 C444 C441 C442 C439 C440
1.8p 1.8p 1.8p 1.8p 1.8p 1.8p 1.8p 1.8p
C416
0.1u
L404 L405 L402 L403
18nH 18nH 5.6nH 5.6nH
2V85_RF 1V5_RF
1V5_RF 2V85_RF
C417 C457
1u 10u
C418 C419 C420
0.1u 47n 0.1u
FE2
33
VBIAS
34
VDDTX1V5 VDDRX2V8
35 20
TX1 VDDRX1V5
U402
36 19 R414
TX2 VCO_RC
37 PMB6272 18 820
VDDTX2V8 VDDVCO2V8
R418 38 17
VDDMIX2V8 EN
39 16
10
GND3 VDDXO2V8
40 15
C424 C425
FSYS1
14
0.1u 0.1u GND4 GND1
41 13
1V5_CORE 2V85_RF
100p
R423 C426 R424
10 0
C428 C429 C427 1000p
0.1u 0.1u BT_CLK
R426
RF_CLK
0
R427
RF_DA
0
R428
QX
0
C432 C433
NA NA
R429
Q
0
R430
IX
0
C434 C435
NA NA
R431
I
0
4 5 6
7 8
R403 100ohm
ANT_SW1
R405 100ohm
ANT_SW2
R441 100ohm
ANT_SW3
C454 C453 C452
100p 100p 100p
VSUPPLY
NC3 LB_RFIN
20 7 R407
L407
NC2 U401 VRAMP
15 6 0
15nH
NC1 VMODE
10 RF3158 5
VBATT
4
LB_RFOUT TX_EN
12 3
BAND_SEL
2
HB_RFOUT HB_RFIN
18 1
L406 C401 C402 C409 C403
10nH 100p 100p 100p 100p
C408 C414
33u
27p
2V7_VCXO
R448
0
C421 C422
0.1u 0.1u
22K R417
RF_TEMP
R419
RF_EN
0
10K PT401
26MHZ_MCLK
C423 1000p
2V7_VCXO
R449
0
X401
R425 620
3 1
OUT VCONT AFC
4 2
VCC GND C430 C455
C431 22p NA
26MHz
1uF
7 8
- 122 -
9 10 11
LBAND_PAM_IN
PA_LEVEL
MODE
TXON_PA
PA_BAND
HBAND_PAM_IN
Engineer:
LG Electronics
Drawn by:
R&D CHK: W.J.KIM TITLE:
SON80 CARD
DOC CTRL CHK:
Issue 1.0
MFG ENGR CHK:
Changed by: Date Changed: Time Changed: QA CHK: REV: Drawing Number:
mentor 2005-06-01 3:07:35 pm
9 10 11
12
A
B
C
D
E
F
G
H
Size:
A3
12 1 8 A
Page:
3/5
12