AL21 - RF Diagram
frontend
internal
GSM 850 LNA
antenna
external
antenna
BATT+
1
869-894 MHz
2
antenna
mechanical
matching
DC autocalibration
GSM 900 LNA
IQ demodulator
antenna
1/2
switch
925-960 MHz
VDD_RF1
VDD_RF2
1
GSM 1800 LNA
2
BANDSW
IQ demodulator
1805 - 1880 MHz
PA_RAMP
RF_FE_DCR_GSM
State
1930 - 1990 MHz
RF_FE_DCR_DCS
machine
TXONPA
GSM 1900 LNA
Serial
RFCLK
Interface
RFSTR
FEM incl. RFDATA
SAW &
1/2
PIN-diode 1/4
26_MHz_BB
integr. RF VCO
switch and
3476 - 3980
RF_FE_DCR_GSM
CP PFD D
matching 26_MHz_BT
RF PLL integr. IF VCO
MHz
+
1
640 - 656 MHz
1/2
TVCXO
R
CP PFD D
1
RF_FE_DCR_DCS VCXO +
1
26 MHz
Crystal
R AFC_PNM
AFC_PNM
PCN GSM
26MHz 1
TXONPA
26MHz
Varicap
PA
Analogue /
Hitachi
Digital Phase -
to Baseband
frequency
Internal power
to Bluetooth
detector IQ modulator
control using
PA_RAMP
"current sensing" 3rd output
RF_I
Feedback filter
RF_IX
Vapc
850/900
+
1
PD
1/2
2
charge phase
RF_Q
pump detector
1/2
RF_QX
1800/1900
Transceiver IC
Integrated 4 GHz
TX-VCO
Bright 6 E
BATT+
radio part base band
Basebend