Table Of Contents - LG KG110 Service Manual

1. INTRODUCTION......................................................................................................................3
1.1 Purpose ....................................................................................................................................3
1.2 Regulatory Information ..............................................................................................................3
A. Security ..................................................................................................................................3
B. Changes in Service ................................................................................................................3
C. Maintenance Limitations ........................................................................................................3
D. Notice of Radiated Emissions ................................................................................................3
E. Interference and Attenuation ..................................................................................................4
F. Electrostatic Sensitive Devices................................................................................................4
2. SYSTEM SPECIFICATION ......................................................................................................6
3. TECHNICAL BRIEF ................................................................................................................7
3.1 KG110 Block Diagram ..............................................................................................................7
3.2 RF Part Introduction ..................................................................................................................8
3.2.1 Receiver Part......................................................................................................................8
A.Low Noise Amplifiers................................................................................................................9
B.Down-Converting Mixers..........................................................................................................9
C.Baseband Amplifiers / Low Pass Filters ................................................................................ 9
D.Baseband Output D.C. Offset Correction ..............................................................................10
E.Receiver Local Oscillator (LO) Generator..............................................................................10
3.2.2 Transmitter Part ..............................................................................................................10
A. Power Amplifier Module ........................................................................................................11
B.Quadrature Modulator ............................................................................................................11
C.Phase Frequency Detector (PFD) ........................................................................................12
D.Loop filter ..............................................................................................................................12
E.TX VCO..................................................................................................................................12
F.Feedback Down-Converting Mixer ........................................................................................12
G.Transmit Frequency Plan ......................................................................................................12
H.Main Frequency Synthesizer ................................................................................................12
I.Fractional N Dividers ..............................................................................................................13
J.Phase Frequency Detector/Charge Pump..............................................................................13
K.Synthesizer Loop filter ..........................................................................................................13
L.Voltage Controlled Oscillator ..................................................................................................13
3.2.3 The Crystal Reference System ........................................................................................13
3.2.4 Power Management ........................................................................................................14
A.LDO Usage ............................................................................................................................14
3.3 Baseband Introduction ............................................................................................................15
3.3.1 Baseband Processor (AD6720 , U101)............................................................................15
3.3.2 Interconnection with external devices ..............................................................................15
A. RTC block interface ..............................................................................................................15
B. LCD module interface ..........................................................................................................16
C. RF interface ..........................................................................................................................16
D. SIM interface ........................................................................................................................17

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