15
1. RF Transmit/Receive Part
1.1 Overview
The Tx and Rx part employs the Direct-Conversion system. The Tx and Rx frequencies are
824.04~848.97 and 869.04~893.97. RF signals received through the antenna are seperated by the
duplexer.
RF Signal fed into the YGHF-D010A(RF onechip module). The RF signal is changed into baseband
signal directly. Then, this signal is changed into digital signal by the analog to digital converter (ADC,
A/D Converter), and the digital circuit part of the MSM(Mobile Station Modem) 6100 processes the
data from ADC. The digital processing part is a demodulator.
In the case of transmission, YGHF-D010A receives OQPSK-modulated anlaog signal from the
MSM6100.
The YGHF-D010A connects directly with MSM6100 using an analog baseband interface.
In YGHF-D010A, the baseband quadrature signals are upconverted to the Cellular frequency bands
and amplified in order to have enough power for radiation. Finally, the RF signal is sent out to the cell
site via the antenna.
1.2 Description of RF Part Circuit
1.2.1 RF onechip Module (
YGHF-D010A)
The RF SPM is a fully intergrated RF module for mobile handsets execpt V-TCXO. This module can
be operated in CDMA & GPS mode. This module adopted ZIF(Zero IF) chipsets that include the
VCO’s, PLLs, up/down mixers, LNA, base band LPF, and Transmitter AGC amplifier. Also additional
components are fully intergrated such as BPF, power amplifier, duplexer, swithchs. Receiver LNA
used operates 4-stepped gain control. IN addition the receiver can be controllable IP2 and automatic
DC-offset calibration. This module includes transmitter base band amplifier, up-converter, drive
amplifier. The transmitter power can be controllable greater than 85dB dynamic rages and operated
under 2.8V supply voltage except the power amplifier. The two types of filter is used for this module.
One is Tx/Rx BPFs made by CSP(Chip Scale Package) technoloty. The other is Saw Duplexer that
has high isolation and attenuation.
CHAPTER 3. Circuit Description
Z3X-BOX.COM
Содержание LG-UD90c
Страница 1: ...CDMA PORTABLE CELLULAR PHONE LG UD90c SERVICE MANUAL Z 3 X B O X C O M ...
Страница 20: ...LG KG90C 20 LG UD90C MAIN TOP LG UD90C MAIN BOTTOM CHAPTER 4 Trouble Shooting Z 3 X B O X C O M ...
Страница 22: ...LG KG90C 22 Circuit Diagram Test Point 2 6V_MSMP PS_HOLD 1 85V_MSMC U1303 MAX1827 Z 3 X B O X C O M ...
Страница 23: ...LG KG90C 23 Waveform TCXO TCXO_OUTPUT X1100 Z 3 X B O X C O M ...
Страница 25: ...LG KG90C 25 Test Point Waveform CON601 No 18 19 2 8V_L 2 65V_MSMP U3100 Vout_BL Z 3 X B O X C O M ...
Страница 27: ...LG KG90C 27 Test Point Circuit Diagram CON3100 X3100 X3100 pin3 Z 3 X B O X C O M ...
Страница 29: ...LG KG90C 29 Test Point Circuit Diagram Mic R211 Mic bias resistor MSM6100 Z 3 X B O X C O M ...
Страница 30: ...LG KG90C 30 5 When Receiver Earpiece isn t heard Checking Flow Z 3 X B O X C O M ...
Страница 31: ...LG KG90C 31 Test Point Circuit Diagram R3000 R3001 U1409 Z 3 X B O X C O M ...
Страница 33: ...LG KG90C 33 Test Point Circuit Diagram MOTOR_EN TP3001 Motor pad Z 3 X B O X C O M ...
Страница 35: ...LG KG90C 35 Test Point Circuit Diagram U2001 Z 3 X B O X C O M ...
Страница 37: ...LG KG90C 37 Test Point Circuit Diagram CON2000 Z 3 X B O X C O M ...
Страница 39: ...LG KG90C 39 Test Point Circuit Diagram Blue Tooth ANT U2000 Z 3 X B O X C O M ...
Страница 41: ...LG KG90C 41 Test Point Circuit Diagram U1409 U1403 CON 1401 U1401 Z 3 X B O X C O M ...
Страница 42: ...LG KG90C 42 11 When Tx power isn t good enough Checking Flow Test Point Z 3 X B O X C O M ...
Страница 43: ...LG KG90C 43 Circuit Diagram U1107 U1106 X1100 U1101 Z 3 X B O X C O M ...
Страница 44: ...LG KG90C 44 Waveform Z 3 X B O X C O M ...
Страница 46: ...LG KG90C 46 Test Point Circuit Diagram U1107 U1101 X1100 Z 3 X B O X C O M ...
Страница 66: ...Z 3 X B O X C O M Rx Pass Rx Path Tx Path MIC Path Speaker voice mp3 MIDI RX 824Mhz 849Mhz TX 869Mhz 894Mhz ...
Страница 67: ...Z 3 X B O X C O M ...
Страница 68: ...Z 3 X B O X C O M R1335 R1336 47K 10k변경 5 1 일 R1356 R1357 DNI 560k R1317 DNI 200K 변경 5 1일 ...
Страница 69: ...Z 3 X B O X C O M L1404 L1405 220n 1K 1608 R1434 R1437 10k 1K 1005 R1436 R1435 10k 56k 1005 변경 5 1일 MIDI ...
Страница 70: ...Z 3 X B O X C O M C1510 100n 0 1uF 변경 5 1일 ...
Страница 71: ...Z 3 X B O X C O M ...
Страница 72: ...Z 3 X B O X C O M ...
Страница 73: ...Z 3 X B O X C O M C2010 10n 6 8n 5 1일 변경 ...
Страница 74: ...Z 3 X B O X C O M ...
Страница 77: ...Z 3 X B O X C O M U3100 Charge pump Not LCD backlight on ...
Страница 79: ...Z 3 X B O X C O M M2001 Microphone MIC not work ...
Страница 81: ...Z 3 X B O X C O M U4009 Touch sensor Touch key not work ...
Страница 82: ...Z 3 X B O X C O M ...