Samsung Electronics
2-5
2-5 RADIO INTERFACE
2-5-1 RF Block Diagram
2-5-2 Baseband Filter
To control the spectral splatter and thus the intersymbol interference (ISI), filtering is applied to the baseband
pulses. The required filtering achieved very simply using a small, low cost discrete LC structure, which has the
great advantage of not consuming current.
Circuit Description
LNA
RX SAW
RX SAW
IF
SAW
225 MHz
45 MHz
LC FILTER
÷
6
HARMONIC
FILTER
TX/RX SWITCH
ANTENNA
SOCKET
947 MHz
270 MHz
Active Bias
HD 155101BF BRIGHT
270 MHz
902 MHz
540 MHz
45MHz
270 MHz
÷
2
OPLL LOOP
FILTER
TX SAW
POWER
AMPLIFIER
RAMP DAC
DETECTOR
POWER CONTROL LOOP
I
AGC
DAC
Q
I
Q
AGC AMPLIFIER
IQ
DEMOD
IQ
MOD
90
o
SHIFT
÷
2
90
o
SHIFT
÷
2
PHASE
DET.
TX
VCO
VHF
VCO
UHF
VCO
13
MHz
AFC
DAC
1172 MHz
DUAL
SYNTH
RF
Buffer
< Fig. 5 RF Block Diagram >
Содержание SGH 600
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