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4. TROUBLE SHOOTING
(4) Checking TX I/Q
TEST POINT
C544
U501
Figure 4.3.4
CIRCUIT
Checking Flow
C515
C520
0.1u
AD6548
U501
25
RX1900B
26
RX1900
27
RX1800B
28
RX1800
29
RX900B
30
RX900
31
RX850B
32
RX850
33
GND
Check if there is
Any Major Difference
Refer to Graph4.3.4
Re-download the Software
And calibrate
- 50 -
Waveform
Graph 4.3.4
QP
C515
39p
QN
16
VLDO2
15
VLDO1
14
VBAT
13
VDD
12
VCC_TXVCO
11
TXOP_HI
10
TXOP_LO
9
VLDO3
IP
C544
39p
IN
No
Replace U501
Similar?
Yes
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