3. TECHNICAL BRIEF 3. TECHNICAL BRIEF 3.1 General Description The L-06A supports UMTS-800, UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based GSM/GPRS/UMTS. All receivers and the UMTS transmitter use the radioOne Zero-IF architecture to eliminate intermediate frequencies, directly converting signals between RF and baseband. The tri-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.
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3. TECHNICAL BRIEF L-06A A generic, high-level functional block diagram of L-06A 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) (plus two duplexers for UMTS high-band and low-band operations).
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3. TECHNICAL BRIEF L-06A L-06A power supply voltages are managed and regulated by the PM7540 Power Management IC. This versatile device integrates all wireless handset power management, general housekeeping, and user interface support functions into a single mixed signal IC. It monitors and controls the external power source and coordinates battery recharging while maintaining the handset supply voltages using low dropout, programmable regulators.
3.2 GSM Mode 3.2.1 GSM Receiver The Dual-mode L-06A’s receiver functions are split between the three RFICs as follows: ■ UMTS-800, UMTS-2100, GSM-900, DCS-1800, and PCS-1900 modes use the RTR6280 IC only. Each mode has independent front-end circuits and down-converters, but they share common baseband circuits (with only one mode active at a time).
RF and baseband. A generic, high-level functional block diagram of L-06A 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 SPDT( Single Port Double Throw ).
fi les to the handset. LGMDP is designed to be simple to use and easy enough for the beginner to upload executable images to the handset. LGMDP supports Windows 2000/XP where the LG USB modem driver is installed. Additionally, LGMDP allows multi downloading up to 8 handsets at the same time.
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