Nokia 3105 Servicehandbuch
RH-48
Troubleshooting - RF
CCS Technical Documentation
Page 14
©
2003 Nokia Corporation Confidential
Issue 1 11/2003
Cell Power Amplifier
The power amplifier (PA) has the DC/DC converter (PMIC device), which controls the
transmitter. The following tables show the circuits that have an effect on the transmitter
path and how to troubleshoot them.
transmitter. The following tables show the circuits that have an effect on the transmitter
path and how to troubleshoot them.
*Not an actual FlaLi tuning PDM. PDM to produce approximately 25dBm at antenna connector.
Tx AGC (6)
-94
15
6
24
Tx AGC (7)*
-280*
25
21
27
PA Power and Gain Measurements
Power Amplifier Input
Test Point
Test Point
Power Amplifier Output
Test Point
Test Point
pin3-Z601
left-R814
PA Power and Gain Specifications
Mode
Name
Power
Output
Range
Nominal
Gain
Vcc Range
Vcc Test
Point
Gain mode 0
V0
up to 6
23.8
0.75- 0.88
C806
Gain mode 1
V1
6 to 11
25.2
1.125- 1.375
C806
Gain mode 3
V2
Not used
Not used
2 - 2.5
C806
Gain mode 2
Bypass
11 up
29
3 - 4
C806
Overall Gain
V0 to
Bypass
Bypass
6
3.5 to 7.3
+/- 0.5
+/- 0.5
unit
N/A
dBm
dB
VDC
N/A
Phoenix Control and Example Values
PA Gain Step
Gen IO 12 GenIO13
PA Vcc
volt (v)
Spec
Name
L
L
0.8
V0
H
L
1.2
V1
L
H
2.2
V2
H
H
3.7
Bypass
Tx AGC Tuning
Tx Tuning
AGC Step
Tx AGC
PDM
Value
Target
Power
Low Limit
High Limit