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Block diagram
The functional block diagram shows the IFX RF solution of the A55/C55
internal
SAW
antenna
925-960 MHz
942.5 MHz
antenna
FEM incl.
matching
SAW
SAW
external
antenna
1842.5 MHz
mechanical
antenna
1805 - 1880 MHz
switch
Antenna
low pass
filter
Pin-diode
switch incl.
TX harmonic
TX_GSM
filtering
(FEM1)
TX_DCS
(FEM2)
OSW1
(Low=GSM
High=DCS)
PA_Ramp
TXONPA
(200mV for
(enable)
Band
lowest output
(Low=GSM
level)
High=DCS)
PCN
GSM
GSM
VCC
2_8
BATT+
BATT+
enable
enable
VCC_SYN
(for Smarti
V RF2
supply)
Salzburg
2.85V
D0950
VCC2_8
V REF1
V 1.10
A52/A55/C55 IFX
RF-Part of L55 Tuna / Infineon
+/- 45°
GSM LNA
Divider
(-20dB at low
%2
gain)
IQ demodulator
+/- 45°
DCS LNA
(-20dB at low
gain)
IQ demodulator
FEM1
FEM2
OSW1
RF PLL
LOOP-Filter
CP
PFD
R
+
1
D
1
LFS
for fast lock
Divider
Tune voltage
within 0.5..2.3V
internal
%2
RF VCO
3420 - 3540 MHz
VREG
3540.4 - 3700 MHz
Int. Voltage
3700.4 - 3820 MHz
Regulator
3820.8-3839.2 MHz
AFC voltage
Tenv
(from E-Gold)
(Temp
sensor)
VCXO
integrated active
part
26 MHz
TXON1
Buffer-Limiter
(enable)
Band
PMB2256
(Low=GSM
High=DCS)
(Lumpi)
+/- 45°
DCS
IQ modulator
+/- 45°
SAW
H3-Filter
VCC
(for mod
2_8
spectrum)
IQ modulator
VCXOEN
VCC_SYN
is supply for all
SLEEPQ
Page 14of 45
Company Confidential © Copyright Siemens AG
PGC
(2dB steps)
PGC
(2dB steps)
BB filter
BB filter
DC autocalibration
BB filter
BB filter
PGC
PGC
(2dB steps)
(2dB steps)
Logic
Outputs
BB-Out
BB-Out
State
machine
Serial
Interface
Buffer
26MHz
RC-Lowpass
Transceiver IC
Smarti DC2
Divider
%2
PMB6256
RC-Lowpass
Chip VCC's
PLL_ON
AFC
PA_RAMP
TXON1
TXONPA
RFSTR
RFCLK
RFDATA
SIN 26MHz
TVCXO
(Tenv)
BB: RF_I
BB: RF_IX
BB: RF_Q
BB: RF_QX
ICM MP CCQ GRM
08/03
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