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5．检查 PAM 控制信号
检测点
电路图
VSUP8_LDO2
25
FLK
27
SY N_CP
13
DAC1
8
DAC2
16
DAC3
22
L203
1.8nH
LKDET
18
RFOUTB
19
L204
RFOUT
22nH
6
U203
4
L205
1.8nH
AD6541
SAFEH2G01FL0F00
14
FILT
29
NC
33
GND
DAC1_PA_VREF
C255
NA
VBAT_RF
C241
C242
C243
10u
(1608)
1u
FL201
2
C247
100p
OUT2
IN
OUT1
C248
C249
0.5p
0.5p
DBB2RF_TD_PAMODE
Q201
4
3
E2
C2
5
B2
2
B1
DBB2RF_PA_EN
6
1
C1
E1
KRX 204E
C246
12p
0.1u
U202
10
1
VCC1
VCC2
2
9
VBIAS
GND
3
8
L206
RFIN
RFOUT
4
7
VCONT
GND1
5
6
VREF
GND2
SKY 77161
C253
C254
1000p
100P
- 89 -
4. 故障解决
VBAT_RF
C245
C244
10u
0.1u
(1608)
IS201
1.8nH
RF_TD_TX
IN
OUT
GND1 GND2
PGND
C250
QTBMT2-2017B001T
NA
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