Samsung SCH-A302 Service Manual page 52

SCH-A302 Circuit description & Circuit Diagrams
5. RF Circuit Diagram
1 2
A
B
R206 C218 C237
R218
56PF
47PF
10K
4.7
D201
L209
C221 C238
R219
33nH
4PF 47PF
4.7
D202
R209
R211
C223
0
56PF
R213 0
C
C226
R214
1.8K 470PF
R221
1.2K
C227
1UF
10V L212
C233
NC
RFT-IFR_TCXO
TX_LO
RFT_TCXO
C250 1NF
IFR_TCXO
C244
NC
D
3.0_RX
E
R480
0
C435 C436
10NF 100PF
L405
8.2nH
U404
C409 C437
R424
1NF 100PF
F
0
3 1
RX_LO RF_OUT GND1
R426
R425
NC 4 2
NC
GND2 RF_IN
3.0_SYN
L403 R420
10
C418
10NF
G
RX_IF_IN
RX_IF_DO
H
1 2
3 4 5
3.0_TX_IF
L204
C202
27NH
100NF
C204
47PF
C203
4.7NF
C201
R207
L205
22PF
1K
27NH
TX_IB
C207
100PF
C210
180PF
TX_I
TX_QB
C211
180PF
TX_Q
3.0_TX U204
1 2 3 4 5 6 7 8 9
G G
33 34
IREF IREF VDDA3
32 10
TXVCO_T2 VDDA4
31 11
TXVCO_T1 PCSB_OUT
30 12
VDDD PCSA_OUT
29 13
RFT3100-32BCCPF-MT
CELLB_OUT
PD_OUT
28 14
R210
PD_ISET CELLA_OUT
27 15
12K,1%
LOCK LOCK_DET VDDA5
26 16
G G
36 35
C235
1NF
25 24 23 22 21 20 19 18 17
3.0_MP
C229
100PF
C234
56PF
C240
R216
15PF
100
C239
NC
3.0_TX_LO
L602
8.2nH
U610
L601
5.6nH
F401
3
4 OUT
COUP
2
5
G
G R404
0
6 1
ISO
IN
C438
R643
100PF
51
C406
NC
L406
5.6nH
C412
R410
C411
16 100PF
100PF
R413 R411
C414
20
0
56PF
OSC402
7
C415
C416 R415 C417
VCC
33UF
1 OUT 5 100NF
3.9NF 5.1K
6.3V VT
2 3 4 6 8
C421
220NF
20V C422
10NF
C427
10PF
R418
0
C428
10NF
3 4 5
SAMSUNG Proprietary-Contents may change without notice
6 7
C243
NC
3.0_TX
R202
1K
TX_AGC_ADJ
R204 U202
3.0_TX_IF 3.0_TX
100K
6 R2 1
R1C1
5
VON/OFF C1
PA_ON
C208 L202
4
C2
10NF VINR1
3.0_TX_RF 3.0_TX
L210
C217 C216
10NF 47PF
3.0_TX
3.0_TX_RF 3.0_TX_RF
C222
R208 R220
8PF
0 51
3.0_TX_LO
C225 R212 L206
3.0_TX
NC NC 10nH
L211
C231 C23
100PF 1NF
C230
10NF
PA_ON
SBST
SBDT
SBCK
C653 C654
100PF
10NF
C655
100PF
C656
R647
1NF
51
TX_LO
R645 R646
120 120
3.0_SYN
R406
L402
10
C407
C408
1NF
100PF
C410
10NF
23 24 2 22 OSC401
C413
100PF
3
8
5 TCXO_IN
RX_IN
6
_RX_IN
4
3 1
DO_RF GND1
4 R427
GND2
17
GND3 7 1M
_IF_IN U402
9
GND4
18 C423
GND5 10
IF_IN
100PF
GND6 13
C424
20 16
GND7
DOIF 100PF
GND8 19
21
GND9 C426
100PF
14 15 12 11
PLL_CLK
PLL_EN
PLL_DATA
C431 C432 C433
100PF 100PF 100PF
6 7
10-8
8 9 10
C205
10NF
C209
2.2UF
16V
R203
270
U203 R205
100K
1 R1C1 6
R2
C213 C214
C215
2 2 C1 5
VON/OFF 2.2UF 10NF
100PF
16V
3 3 4 PA_R0
C2
VINR1
L201
VBATT
C219
10NF C220
33UF
6.3V
2
R414
2.2K
TRK_LO_ADJ
1
C419
C420 3.0_TCXO
10NF
220PF
L213
C425
10NF
TCXO
RFT_TCXO
C429
470PF
Changed by LJC Date Changed
2001.09.18
8 9 10
11 12
R222
0
TXOUTPUT
U201
A
12
G
11
VCC2 G
10
R648 R649
G
9
G NC NC
VCC1
8
G
7
VREF
6
LABEL
G
R201
0
B
5 F201
C224
NC
6
4
3
1
2
C
D
E
F
G
H
COMPANY NAME
Engineer LJC
Address
Drawn by LJC
City
Size
TITLE
R&D CHK
A2
SCH-302 (i)
DOC CTRL CHK
MFG ENGR CHK
Time Changed REV
Drawing Number Sheet 2 of 3
QA CHK
4:55:22 pm 0 6
11 12