LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
- 15 -
3.1 General Description
The KE990/KE990c supports EGSM-900, DCS-1800, and PCS-1900 based GSM/GPRS/EDGE. All
receivers and 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 upconversion followed by an offset phase-locked loop that translates the
GMSKmodulated or 8-PSK-modulated signal to RF.
A generic, high-level functional block diagram of KE990/KE990c is shown in Figure 3-1. One antenna
collects base station forward link signals and radiates handset reverse link signals. The antenna
connects with receive and transmit paths through a FEM(Front End Module).
3. TECHNICAL BRIEF
Quadrature
Upconverter
Quadrature
Downconverter
Quadrature
Downconverter
Quadrature
Downconverter
LPF & DC
Correction
LO generation
& Distribution
LPF & DC
Correction
LPF & DC
Correction
Du
g
it
a
l I
O
s
& c
o
n
tr
o
ls
LPF
Quadrature
Upconverter
LPF
BPF
BPF
BPF
BPF
PLL #1
VCO
LP
F
F ref
F ref
RTR6275_TCXO
VDDM
PLL # 2
VCO
F ref
LP
F
Ctls
Power
Detector
GSM1900
Rx BPF
GSM1800
Rx BPF
S
W
H-BPF
L-BPF
G900
Tx BPF
pa
d
pa
d
GSM/EDGE PA
PM6635-3P
Input Power
Management
Voltage
Regulators
General
Housekeeping
User
Interfaces
IC
Interfaces
Phone
VCTCXO
RTR6275_TCXO
MSM_TCXO
ESM
6
2
7
0
DAC_REF
GSM850
Rx BPF
FM Radio
Module
Bluetooth
Module
1
2
3
5
4
G
E SM / DCS1800/
PCS1900
1. RTR6235 for GSM/EDGE Tx
2. RTR6235 for GSM/EDGE Rx
3. PM6635-3P for Power
Management
4. FM radio Module
5. Bluetooth RF Module
[Fig 3.1] Block diagram of RF part
1
QUALCOMM’s branded chipset that implements a Zero-IF radio architecture.
Содержание KE990 - Viewty Cell Phone 100 MB
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