Only For Training And Service Purposes - LG KP330 Service Manual

A generic, high-level functional block diagram of KP330 is shown in Figure 1.1. 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 three duplexers for UMTS-850, UMTS-1900 and UMTS-2100
operations).
KP330 power supply voltages are managed and regulated by the PM6658 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.
The device's general housekeeping functions include an ADC and analog multiplexer
circuit for monitoring on-chip voltage sources, charging status, and current flow, as
well as user-defined off-chip variables such as temperature, RF output power, and
battery ID. Various oscillator, clock, and counter circuits support IC and higher-level
handset functions. Key parameters such as under-voltage lockout and crystal
oscillator signal presence are monitored to protect against detrimental conditions
3.1.1 Primary receive signal paths
The RTR6285/6280 receive paths include four GSM/EDGE Rx signal paths that support GSM
850, GSM 900, GSM 1800, and GSM 1900 bands and four WCDMA Rx signal paths (two
single-ended and two differential) for one UMTS low-band and three UMTS high bands.
The quad-band GSM/EDGE Rx paths start from the handset front-end circuits (GSM Rx filters
and antenna switch module). The four differential inputs are amplified with gain-stepped LNA
circuits. Gain control is provided through software and serial interface. The LNA outputs drive
the RF ports of quadrature RF-to-baseband downconverters. The downconverted baseband
outputs are multiplexed and routed to lowpass filters (one I and one Q) whose passband and
stopband characteristics supplement MSM device processing. These filter circuits allow DC
offset corrections, and their differential outputs are buffered to interface with the MSM IC.
The two RTR6285/6280 UMTS single-ended inputs accept UMTS 2100/1900/1800/1700 input
signals from the handset RF front-end filters. The UMTS Rx inputs are provided with on-chip
LNAs that amplify the signal before second-stage filters that provide differential signals to a
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

KP330 Operational Description
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3. TECHNICAL BRIEF
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LGE Internal Use Only