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Nokia Customer Care
TF4 Technical Information
Company Confidential
TFE-4/RV-1
Issue 2.0 Mar/2005
Copyright
©
2005
Nokia Corporation.
Page 8b-55
Company Confidential
The setup should now look like this:
Step 2:
Doing the Measurement
Now the measurement equipment should measure the following output signal from the
phone:
P
out
= +23dBm @ 897.4MHz
If this is not the case, then go to the TX Troubleshooting section of this document for
troubleshooting.
TX path of the transmitted EGSM900 signal
The components can be grouped into blocks and drawn as shown below. Note that the
picture shows both EGSM900 transmitter (lower) and GSM1800 transmitter (upper).
OUTHP
OUTHM
OUTLP
OUTLM
DET
VB_DET
VANTL / VANTM / VANTH
TXC
TX
P
VTXLOL
TXIP/T
XIM
TXQ
P
/TXQ
M
2
2
PLFB1
PLFB2
VPCH/VPCL
2
VTX
TXC
TXP
VDD
T
X
Supply
filter
VR2
VTXBH
VTXBL
VTXLOH
DET
PA
Dir. Coupler
VBATTRF
PCN/PCS
EGSM
PW-
loop
filter
SAW
VTX
Buffer
Balun
3
PA_IDENT
1/2
1/4
Open
collector
Open
collector
PWC
RF
Controls
RF
Controls
2
2
2
2
VDDDIG
VDDRXBB
Ant Sw
it
c
h
PCN
TX
GSM
TX
PCS
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