Receiver Part - LG KE820 Service Manual

R412
LBAND_PAM_IN
R413 0
HBAND_PAM_IN
0
R420 R421 R415 R416
NA NA NA NA
1V5_CORE
Figure 37 RF transceiver PMB7262 SMARTi-PM schematic

3.21. Receiver part

GSM850 GSM900
2V85_RF
C445 C446 C443
1.8p 1.8p 1.8p
C416
0.1u
L404 L405
18nH 18nH
2V85_RF 1V5_RF
C417 C457
1u 4.7u
FE2
33
VBIAS
34
VDDTX1V5
35
TX1
U402
36
TX2
PMB6272
37
VDDTX2V8
R418 38
VDDMIX2V8
39
10 GND3
40
C424 C425
0.1u 0.1u
GND4
41
2V85_RF
R423
10
C428 C429
0.1u 0.1u
Figure 38 Receiver part block diagram
- 63 -
3. TECHNICAL BRIEF
DCS1800 PCS1900
C444 C441 C442 C439 C440
1.8p 1.8p 1.8p 1.8p 1.8p
L402 L403
5.6nH 5.6nH
1V5_RF 2V85_RF
C418 C419 C420
0.1u 47n 0.1u
VDDRX2V8
20
VDDRX1V5
19 R414
VCO_RC
18 820
VDDVCO2V8
17
EN
16
VDDXO2V8
15
FSYS1
14
GND1
13
2V7_VCXO
100p
R424
C426
0
C427 1000p
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
2V7_VCXO
R448
0
C421 C422
0.1u 0.1u
R419
RF_EN
0
26MHZ_MCLK
C423 1000p
R449
0
X401
R425 620
3 1
OUT VCONT
4 2
VCC GND C430
C431 22p
26MHz
1uF
AFC
C455
NA