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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.1.2.6 RFR6500 - Down-converter Mixers part (U106)
all the circuitry (with the exception of external filters) needed to support conversion of received RF signals to Base-
band signals. The three down-converting Mixers (Cellular, PCS and GPS), and a programmable PLL for generating
RX LO frequency and an RX LO Buffer Amplifier and RX Voltage Controlled Oscillator. The GPS LNA & mixers
offer the most advanced and integrated CDMA RX solution designed to meet cascaded Noise Figure (NF) and Third-
order Intercept Point (IIP3) requirements of IS-98D and J-STD-018 specifications for Sensitivity, Two-Tone Inter-
modulation, and Single-tone Desensitization.
Operation modes and band selection are specially controlled from the Mobile Station Modem
MSM6500.
The specification of VX8350 Mixers is described below:
Low gain
High gain
Units
Cellular
PCS
Cellular
PCS
Noise Figure
25
27
7.9
12
dB
Input IP3
-5
-11
4
4
dBm
Input IP2
30
30
56
56
dBm
Parameter
3.1.3 Description of Transmit Part Circuit
3.1.3.1 RFT6150 (U107)
The RFT6150 Base-band to RF Transmit Processor performs all TX signal-processing functions required between
digital Base-band and the Power Amplifier Modulator (PAM). The Base-band quadrate signals are up-converted to
the Cellular or PCS frequency bands and amplified to provide signal drive capability to the PAM. The RFT6100
includes mixers for up-converting analog Base-band to RF, a programmable PLL for generating TX LO frequency a
TX LO Buffer Amplifier and TX Voltage Controlled Oscillator, cellular and PCS driver amplifiers and TX power
control through an 85 dB VGA. As added benefit, the single sideband up-conversion eliminates the need for a band
pass filter normally required between the up-converter and driver amplifier.
I, I/, Q and Q/ signals proceed from the MSM6500 to RFT6150 are analog signal. In CDMA mode, These signals are
modulated by Offset Quadrature Phase Shift King (OQPSK). I and Q are 90 deg. out of phase, and I and I/ are 180
deg. The mixers in RFT6150 converts baseband signals into RF signals. After passing through the upconverters, RF
signal is inputted into the Power AMP.
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Содержание VX8350
Страница 132: ...1 Assembly and Disassembly Diagram Z 3 X B O X C O M 131 ...
Страница 133: ...Z 3 X B O X C O M Internal Use Only 132 ...
Страница 134: ...Z 3 X B O X C O M Internal Use Only 133 ...
Страница 135: ...2 Block and Circuit Diagram Z 3 X B O X C O M 134 ...
Страница 149: ...3 Part List Z 3 X B O X C O M 148 ...
Страница 160: ...4 Components Layout Z 3 X B O X C O M 159 ...
Страница 164: ...F100 F101 F102 cam3 cam4 CON100 CON102 Z 3 X B O X C O M Internal Use Only 163 ...
Страница 165: ...CON2 Z 3 X B O X C O M Internal Use Only 164 ...
Страница 167: ...CON103 Z 3 X B O X C O M Internal Use Only 166 ...
Страница 168: ...VX8350 CAM_REV1 0 SPKY 0047501 SW100 CON102 Z 3 X B O X C O M Internal Use Only 167 ...
Страница 169: ...CON103 Z 3 X B O X C O M Internal Use Only 168 ...
Страница 170: ...VX8350 F_VOL REV1 0 SPKY 0047701 SW100 SW101 SW102 SW100 SW101 SW102 CON102 Z 3 X B O X C O M Internal Use Only 169 ...
Страница 171: ...5 BGA Pin Map Z 3 X B O X C O M 170 ...