Logic Signals For The Front End Module; Renesa Fem Logic - Nokia RH-53 Troubleshooting Instructions

RH-53/54
32.5 dBm
(29.5 dBm)
VC1 VC2 VTX
Names in () is for high band
All the red signals are pulsed with the burst
The Green "DC" signals are pulsed with the burst
In local mode random burst RF signals can be demodulated by a GSM
tester

Logic signals for the Front End Module

Depending on the vendor of the Front End Module (FEM), different timing of the control signals
are at present:the SW supports both FEMS. R629 tells the SW which FEM control should be
active. Renesas FEM control is used when R629 is 18K and RFMD FEM control is used when
R629 is 82K.
If the FEM is exchanged with an other type, the R629 has to be changed, too.

Renesa FEM logic

Mode
Low Band RX
Low Band TX
High Band RX
High Band TX
ISSUE 1 09/2004
Figure 45:Signals
FEM
N700
BS
Vpc R712
Max PW: 1.2 Vdc
Min PW: 0.65 Vdc
Det
Max PW: 1.13 vdc
Min PW: 0.22 Vdc
Table 13: Renesa FEM logic
Vtx
VTX_B_P VTX_B_P
0 0
1 0
0 1
1 1
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+ 2 dBm
Attenuator
R714
(R711)
TXC (R620) Max PW 1.6V
Min PW 0.6 V
TXP (C646) 2.7V
Opamp (C644) Max PW 1.2 V
Min PW 0.65
R610
R611
BS VC1
Vant1
0
1
0
0
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+ 4 dBm
Z603
(T600)
Mjoelner
N600
VC2
Vant2
0
0
0
1
57