SERWIS ELEKTRONIKI

HELGA
Front end module
IF
RF
PCS1900
LO
OUT
IN
OUT
IN
OUT
IN
OUT
IN
AGC
OUT
AGC
AGC
IN OUT
RXI
IN
IN OUT IN OUT
IN OUT
OUT
IN
OUT1
IF
RF
IN
LO
OUT2
RXO
OUT
IN
AGC
OUT
IN
IN OUT
AGC
OUT
IN
IN OUT
IN OUT
DCS1800
Dt oS 10dB
42dB
DCN2
IF
RF
LO
VRefRF02
26MHz
AFC
AGC
OUT
IN
OUT
IN
IF
RF
IN
VCTCXO
OUT1
AFC
OUT
IN
OUT
LO
IN
REF LE1 CLK DATA
OUT
IN
OUT2
IN
OUT
PLL
f
OUT1
IN
OUT
OUT1
f
3420 ÷ 3980MHz
tracking filter
f/2
IN
OUT2
IN
OUT
IN
OUT2
OUT2
VCO OUT
IN
IN
f/2
EGSM900
Sys clock
OUT1
RX-MIX
IN
IF
RF
OUT
IN
SYNT-MIX
LO
AGC
OUT
IN
OUT
IN
MOD PLL
f
IF
RF
OUT
IN
f/4
f
LO
OUT1
IN
OUT
IN
RF IF
LO
f/4
OUT2
Power amplifier
AGC
EGSM900
RF
IN
OUT
LO
IN
OUT
IN
OUT
IN
IN
IN
IN
OUT
IF
OUT
AGC
IN
OUT
AGC
OUT
AGC
OUT
MEAS
LO
IF
RF
Phase detector
TPA1
BIAS
IN OUT
IN
OUT
f
dB
OUT
IN
f/2
DCS1800/PCS1900
TPA2
MEAS
Telefon komórkowy Nokia 7250
TXIP
TXIM
RF IF
LO
IN
OUT
AGC
IN
OUT
AGC
IN
IN OUT IN OUT
AGC
AGC
OUT
RF IF
LO
SERWIS ELEKTRONIKI 8/2006 37
BIAS
AGC
IN OUT
IN
OUT
OUT1
OUT1
TXQP
TXQM
TXA
TXP
TXC
TXC
TXP
CNTR
15dB
IN
OUT
IN
IN
OUT2
OUT2
IN
OUT
OUT1
IN
Fixed bias
OUT2
CNTR
OUT1
IN
OUT
IN
OUT
Power detector
IN
OUT2
Rys.23. Schemat blokowy toru RF