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5. STH-N271 RF Circuit Diagram
Transmission
Z[OHM]
L[mm]
TL1
50
3.9
TL2
50
1.19
TL3
50
1.12
TL4
65
0.3
V_LNA_PCS
TL5
65
2.6
TL6
65
1.3
TL7
50
0.25
TL8
50
0.5
TL9
50
3.5
C309
C310
10PF
TL10
50
1.5
100NF
L341
NC
AN301
-
L313
6.8nH
F305
C339
U302
C340
100PF
C414
4
8PF
4.7PF
1
3
2
AMPSOUT
OUT
IN
IN
6
PCSOUT
GND
GND
G1
4
2
G2
G3
L315
L336
C347
10nH
10nH
1
3
5
C351
NC
L502
NC
51
GND:135
L337
5.6nH
F307
U303
C361
4.7PF
6
1
1
2
VC1
OUT1
IN
OUT
5
2
GND1
GND2
IN
GND
4
3
3
4
TX_BAT
VC2
OUT2
F308
R335
C371
C372
C373
1NF
1NF
51
27PF
4
3
OUT
TER
2
5
GND1
GND2
1
6
IN
COUP
R382
100K
R348
R349
15K
100
L326
U306
12nH
R351
1
3
2
100K
3
C416
1
2
C424
2PF
10NF
C425
C426
4
D301
5
100PF
NC
R358
18K
R359
R361
L328
56K
100K
NC
C438
TL10
TL9
15PF
C457
C443
C444
3PF
NC
4.7PF
L332
12nH
Note:
1.L325,L332 are High Q inductor (Coilcraft 0805HQ series)
2.C401,C402,C443,C444 are High Q capacitors
DUMMY PAD
L307: 6.8nH for PCS
C471
NC
L502: 10nH for PCS
V_LNA_CELL
R306
R307
10
10
Will be connected
R309
L307
in PCS Model
270
C314
C315
51
R313
10PF
100NF
1K
F303
C319
L308
C321
U301
1.8PF
3.9nH
100PF
2
R315
IN
OUT
10
C324
EN2
EN1
G1
G2
G3
G4
5
4
NC
1
3
4
6
RFIN2
RFOUT2
6
3
C327
GND
GND
7
2
100PF
RFIN1
RFOUT1
8
1
L311
F304
G26
8.2nH
G25
C333
2.2PF
G24
C464
G23
IN
OUT
1.5PF
G22
2
5
G21
G G
G G
C344
C467
R388
G20
100PF
0.5PF
120
1
3 4
6
G19
G18
G17
G16
G15
G14
G13
G12
G11
G10
G8
G7
R381
G6
51
G5
G4
V_RF3
G3
R380
G2
10
G1
V_PA_BIAS_CELL
C368
C369
F306
100NF
100PF
C453
100PF
RF_BAND
F313
R338
R339
R340
L318
0
1K
27ohm
82nH
C385
100PF
9
8
10
4
C396
RFIN
L322
TL3
TL2
TL1
RFOUT
100PF
1nH
11
3
U305
GND
C398
RFOUT
12
2
100PF
GND
RFOUT
C401
C402
5PF
C406
13
14
15
16
17
1
12PF
L325
V_DET
2PF
16nH
TL4
C408
6.8PF
TL5
C420
10NF
TL6
VBAT
C421
C417
C418
TX_PWR
100PF
100PF
10NF
R360
R386
10
NC
V_DRV_CELL
R365
R366
R367
C432
R357
0
1K
0
10NF
1K
C431
R392
100PF
NC
L329
15nH
9
8
7
6
5
C454
NC
F311
RFIN
C439
R385
TL8
R370
4
5.6pF
0
150
2
3
U309
VCC1
IN
OUT
RFOUT
10
3
GND2
GND1
GND2
2
1
4
L335
L333
2.7nH
13
14
15
16
17
1
1nH
C447
1PF
TL7
VBAT
R377
V_DRV_PCS
1K
C449
C450
C451
C452
10UF
100PF
10PF
10NF
10V
SAMSUNG Proprietary-Contents may change without notice
C472
NC
C304
56PF
5
IN
G1 G2
1
R308
0
VRX
C311
C312
100NF
3PF
C316
1.5PF
R314
27ohm
C320
C358
NC
15PF
5
C322
100NF
C325
15PF
V_RF3
C334
C335
8.2PF
100PF
L312
4.7nH
L314
R391
8.2nH
C345
560
1PF
C349
NC
C366
C352
15PF
100PF
R325
R326
27ohm
27ohm
V_RF1
C359
C360
100NF
R329
10UF
27ohm
6.3V
R330
27ohm
C364
C365
C468
10UF
100PF
1UF
C367
6.3V
(1608)
100NF
R333
C376
C377
R379
3.3K
33NF
2.7NF
10
C375
C374
R395
2.2NF
5.6NF
C387
C381
C460
6.2K
5PF
10NF
5PF
V_RF2
C473
100NF
R342
4.7K
F309
C389
R384
R343
8PF
10
4.7K
5
2
L320
C392
OUT
IN
NC
2PF
U310
G
G
G
G
L321
5.6nH
6
4
3
1
R346
270
MOD_FET
ANALOG_DIG
C390
2PF
L324
R347
8.2nH
10
V_DRV_CELL
C409
C410
L327
C458
82nH
100PF
100PF
100NF
U307
1
6
RFOUT
VCC
F310
2
GND 5
GND
C415
100NF
L340
L334
100PF
C430
6.8nH
6.8nH
3
4
GC
RFIN
OUT
IN
5
2
R387
G
G
G
G
2K
C455
2PF
6
4
3
1
R364
V_DRV_PCS
0
L330
3.3nH
C436
C437
L331
C459
100NF
10PF
4.7nH
10PF
C440
4.7PF
U308
1
6
RFOUT
VCC
F312
2
GND 5
C441
GND
R371
R372
100PF
15
15
3
4
GC
RFIN
3
OUT
IN
GND2
GND1
R376
4
1
82
R390
C448
5.6K
100NF
11-11
F301
R303
R301
R302
27ohm
470
820
1
3
VRX
IN
OUT
G1
C302
C303
G2
G3
G4
C466
100NF
100PF
2
4
5
6
NC
L301
F302
22nH
C305
C306
7PF
1NF
C307
2
68PF
OUT
G3 G4
L302
R305
3
4
6
560
220nH
L303
150nH
C308
8PF
C313
R310
10NF
C474
L305
L306
150nH
560
1NF
15uH
R316
C323
270
5PF
C475
C429
C326
100NF
100NF
C342
100NF
C328
10PF
R383
10
L317
5.6nH
C343
100NF
C337
100PF
C350
15PF
C456
15PF
41
20
C354
MIX1_OUT
LIMOUT
42
19
15PF
MIX1VCC
RSSI
43
18
PCS_IN
QUAD
44
17
MIX1_INB
AGC
45
16
CELIN
FM_AUDIO
C355
46
15
R393
MIX1GND
FEEDBACK
100PF
47
14
27ohm
LOAMP_GND
RXIF_GND2
48
13
CELL_LO_AMP_IN
RXIF_VCC2
49
12
U304
PCS_LO_AMP_IN
RXI
50
11
R394
LO_AMP_VCC
RXIB
51
10
27ohm
PLL1VCC
RXQ
52
9
CP1_VCC
RXQB
53
8
PLL1_CP
IOSGND
54
7
CP1_GND
TCXO
55
6
PLL1FLSW
MOS_VCC
56
5
PLL1GND
LD
57
4
PCSOUT
MOSGND
58
3
DRV_GND
DATA
59
2
CELLOUT
CLK
60
1
TXVCC
EN
R341
2.4
C386
100PF
C388
100NF
L304
TXDA_REF
2.7nH
C397
10PF
C399
100PF
L323
6.8nH
C407
8.2PF
R345
5.1K
PA_CNT
R354
100
C400
R389
1NF
11K
V_RF1
R350
OSC303
10
2
V_RF2
TX_IN
VCC
TX_I
TX_QN
1
TX_Q
RFOUT
C462
C419
56PF
G
G
G
100NF
8
7
6
Q301
R373
10
R334
3
1K
TX_RFBAND
2
1
C465
100NF
2
STH-N271 Circuit diagrams
R304
C301
2.4K
100NF
VRX
V_RF1
C317
C318
R312
4.7NF
4.7NF
470
680PF
C329
C330
R320
L310
390PF
33PF
4.7K
330uH
C331
100NF
C338
10NF
A_IF_IN
RSSI
R321
10K
C346
2.7NF
R322
C348
100NF
470
AGC_OUT
R323
1.5K
DEMOD
C353
2.2NF
C356
220nF
MOD_FET
R327
R324
L339
150K
10K
2.2uH
C476
VCTCXO_IN
2.2NF
R328
27ohm
V_RF1
C463
RX_I
56PF
C357
100NF
RX_IN
RX_Q
C363
RX_QN
10NF
C362
10PF
V_RF1
C370
100NF
OSC302
R332
R336
C461
10
10NF
6.2K
D302
C380
LOCK_DET
R337
10UF
10K
6.3V
(N.C)
R397
C384
39K
L338
C383
C378
4.7uH
10NF
10NF
R396
NC
R331
NC
NC
PLL_DATA
PLL_CLK
PLL_STRB1
AFC_OUT
C393
C394
C395
V_VCTCXO
100PF
100PF
100PF
R344
10
RX_BAT
ALC_EN
PON_LD
C411
C412
C413
1NF
1NF
1NF
R356
10
V_IF_VCO
C428
C427
10UF
1NF
6.3V
3
R362
R363
VT
27K
2.2K
4
SW
C434
C433
C435
G
1UF
R368
4.7NF
10NF
5
33K
R369
2.2K
C442
R374
8.2NF
R375
0
470K
MOD
C445
C446
R378
10NF
NC
6.2K
V_IF_VCO
LC FILTER : C(470),L(340,334)
Q301
R397
C476(379)
L341
F313
U310
OSC303
STH-N271_RF
D302
AN301
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Troubleshooting
