LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.1 General Description
The KF700 supports UMTS-2100, EGSM-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 upconversion followed by an offset
phase-locked loop that translates the GMSK-modulated or 8-PSK-modulated signal to RF.
A generic, high-level functional block diagram of KF700 is shown in [Fig. 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).
The UMTS receive paths each include an LNA, an RF band-pass filter, and a downconverter that
translate the signal directly from RF-to-baseband using radioOne ZIF techniques. The RFIC’s Rx
analog baseband outputs, for the receive chains, connect to the MSM IC. The UMTS and GSM Rx
baseband outputs share the same inputs to the MSM IC.
UMTS (2100 )
GSM (900, 1800 , 1900 )
Bluetooth
1. RTR6275 for GSM Tx
and WCDMA Tx
2. RTR6275 for GSM/ EDGE
Rx and WCDMA Rx
3. Bluetooth RF module
4. PM 6650 for power
management
1
2
4
Bluetooth
RF module
3
FM Radio
Module
5
5. FM Radio Module
[Fig. 3.1] Block diagram of RF part
3. TECHNICAL BRIEF
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3. TECHNICAL BRIEF
1
QUALCOMM’s branded chipset that implements a Zero-IF radio architecture.
Содержание KF700
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