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Rx frontend filter
DCS
Ceramic Filter
1805..1880 MHz
GSM
SAW Filter
925..960 MHz
RX
Antenna
Antenna
Switch
RF Connector with
mechanical switch
TX
Detector and
APC loop
Level control
GSM
880..915 MHz
Directional
PA
LP Filter
coupler + LPF
DCS1800
1710..1785 MHz
Directional
LP Filter
PA
coupler
DET_EN
IC 1
Digital
DET_TX
signals
TXP_OFS_EN
IC 2
Analog
AUX_DAC
TXP
signals
Rx interstage filter
1st Rx mixer
LNA
IF
RF
IF
SAW Filter
440 MHz
SAW Filter
LO
1805..1880 MHz
LNA
RF
IF
RX:
GSM 1365..1400 MHz
SAW Filter
DCS 1365..1440 MHz
LO
925..960 MHz
LNA Bias
Transceiver
control
TX:
GSM 1370..1440 MHz
DCS 1385..1460 MHz
2
DCS
1
Tx GSM VCO
Pin diode
880..915 MHz
switch
Down
Converter
Tx DCS VCO
Pin diode
1710..1785 MHz
switch
Loop
Filter
ϕ
Phase
detector
TX_SW_EN
GSM_TX_EN
GSM_VCO_EN
DCS_TX_EN
DCS_VCO_EN
APC_DOWN
IQ Demodulator
IF Amplifier (PGC)
I
BB amplifier and
90°
∑
0
low pass filter
°
Q
440 MHz
LO1 (RF) PLL:
- RX -
1
GSM 1365..1400 MHz
DCS 1365..1440 MHz
2
- TX -
GSM 1370..1440 MHz
DCS 1385..1460 MHz
LO2 (IF) PLL
RX 880 MHz
TX 975 MHz
GSM
5
TX:
1
GSM 685..720 MHz
DCS 1385..1460 MHz
3/5
GSM :5
DCS :3
1
LP Filter
Sum loop
I
90°
∑
0
°
Q
GSM 195 MHz
DCS 325 MHz
RF_IC_EN
VCC_RF
LDO
VCC_SYNTH
LDO
VCTCXO
13 MHz
LO1 (RF) PLL
N
200 kHz step
N+1
1
Total VCO Range:
1365 to 1460 MHz
ϕ
N
1
LO1
Loop
Filter
VCO
PLL
ϕ
N
1
LO2
Loop
Filter
VCO
M
LO2 (IF) PLL
1 MHz step
1
Total VCO Range:
880 to 975 MHz
RF_EN
RXIP
RXIN
RXQP
RXQN
AFC
CLK13M
SERCK
SERDA
SERLE1
SERLE2
TXIP
TXIN
TXQP
TXQN
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