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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
The KB770 supports UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based
GSM/GPRS/EDGE/UMTS. All receivers and the UMTS transmitter use the radioOne
[1]
Zero-IF
architecture to eliminate intermediate frequencies, directly converting signals between RF and
baseband. The quad-band GSM transmitters use a baseband-to-IF up-conversion followed by an
offset phase-locked loop that translates the GMSK-modulated or 8-PSK-modulated signal to RF.
3.1 General Description
•
UMTS Cell + PCS with Rx
diversity IMT primary only
•
Quad-band EDGE/GPRS
•
Simultaneous-GPS
•
EDGE/GPRS Tx/Rx and
WCDMA Tx are on the
RTR6275 IC
•
One high-band WCDMA Rx is
on the RTR6275 IC
•
Two PLLs on the RTR6275 IC:
–
One for EDGE/GPRS Tx/Rx
and WCDMA Tx
–
One for WCDMA Rx
•
GPS pre-LNA within RFR
•
UHF VCOs within RFR
•
Two PLLs within RFR:
–
One for primary and
diversity receive path
–
One for GPS
•
LO buffers, etc. within RFR
•
No RTR/RFR LO interfaces
–
No External VCOs
1
2
LO Generation
& Distribution
VCO
PLL #1
F ref
Quadrature
Downconverter
Quadrature
Downconverter
s
O/I
la
ti
gi
D
sl
ort
no
c
&
Quadrature
Upconverter
LP F & DC
Correction
LP F & DC
Correction
LPF
LPF
DAC_ REF
VDDM
Quadrature
Upconverter
BPF
BPF
BPF
BPF
F
P
L
VCO
PLL #2
F ref
F
P
L
Quadrature
Downconverter
LO Generation
& Distribution
Power
Detector
ctls
W
S
H- BPF
L- BPF
U 2100
U1900
G 1900 Rx
G 1800 Rx
G 900 Rx
G 850 Rx
U800/ 850
U850
Tx BPF
U2100
Tx BPF
U1900
Tx BPF
W
S
ni
a
hc
ysi
a
d
sr
el
pu
o
c
d
ap
da
p
R
T
R
T
R
T
G 850 &
G900
Rx BPFs
G 1800 &
G1900
Rx BPFs
U 2100
Rx BPF
GPS
Rx BPF
0
02
7/
08
2
6
M
S
M
F ref
RFR6275_ TCX O
MSM_ TCXO
RTR6275
PCS
BPF
Cell
BPF
GPS
BPF
po
ol
r
etli
f
RFR6500
F ref
SBI( s )
and
other
status
control
p
ool
r
etli
f
VDDM
ctls
s
O/
I
l
ati
gi
D
sl
ort
n
o
C
&
CDMA
VCOs
GP S
VCO
LP F
LPF
Pre -
LNA
PLL1
F ref
Diversity
Rx VCO
Diversity
Rx VCO
LO Gen
& Dist
LP F
LP F
Quad
D’convert
LNA
LNA
PLL0
F ref
LO Gen
& Dist
Quad
D’convert
Quad
D’convert
P rimary path
S econdary path
Jammer
detect
RFR6 500_TCXO
W
S
Cell
Rx BPF
PCS
Rx BPF
Primary
Antenna
UMTS Diversity
&
GPS Antenna
GPS
U800/ 850
U1900
LPF
SAW
Figure 3.1 Block diagram of RF part
Содержание KB770
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