LG VX8350 Service Manual page 32

VX8350
RFT6150 Cellular and PCS CDMA RF Specifications
Parameter
Rated Output Power
Min Output Power
RX band noise power
ACPR
3.1.3.2 Power Amplifier(U103,U104)
The power amplifier that can be used in the PCS and CDMA mode has linear amplification capability and high
efficiency. For higher efficiency, it is made up of one MMIC (Monolithic Microwave Integrated Circuit) for which
RF input terminal and internal interface circuit are integrated onto one IC after going through the AlGaAs/GaAs HBT
(heterojunction bipolar transistor) process. The module of power amplifier is made up of an output end interface
circuit including this MMIC. The maximum power that can be inputted through the input terminal is +10dBm and
conversion gain is about 26.5dB. RF transmit signals that have been amplified through the power amplifier are sent to
the duplexer.
.
3.1.4 Description of Frequency Synthesizer Circuit
3.1.4.1 Voltage Control Temperature Compensation Crystal Oscillator (VCTCXO, X100)
The temperature variation of mobile phone can be compensated by VCTCXO. The reference frequency of a mobile
phone is 19.2 MHz. The receiver frequency tuning signals called TRK_LO_ADJ from MSM as 0.5 V~2.5 V DC via
R and C filter in order to generate the reference frequency of 19.2 MHz and input it into the frequency synthesizer.
Frequency stability depending on temperature is ±2.0 ppm.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Condition
Average CDMA Cellular
Average CDMA PCS
Average CDMA Cellular
Average CDMA PCS
CDMA Cellular
CDMA PCS
Cellular: Fc±885kHz
PCS : Fc±1.25MHz
31
Min. Type. Max.
7
9
-75
-75
-136
-133
-56
-57
LGE Internal Use Only
Units
dBm
dBm
dBm
dBm
dBm/Hz
dBc/30kHz