LG VX11000 - Page 33

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LG Electronics Inc.
VX11000
zRTR6500 Cellular and PCS CDMA RF Specifications
Parameter Condition Min. Type. Max. Units
Rated Output Power
Average CDMA Cellular
Average CDMA PCS
+7
+7
dBm
dBm
Min Output Power
Average CDMA Cellular
Average CDMA PCS
-66
-41
dBm
dBm
RX band noise power
CDMA Cellular
CDMA PCS
-140
-140
dBm/Hz
ACPR
Cellular: Fc±885kHz
PCS : Fc±1.25MHz
-48
-48
dBc/30kHz
1.3.2 Dual Power Amplifier(U1008)
The Dual 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 26dB. RF transmit signals that have been amplified through the power amplifier are sent to
the quintplexer.
1.4 Description of Frequency Synthesizer Circuit
1.4.1 Voltage Control Temperature Compensation Crystal Oscillator (VCTCXO, U1003)
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 0.4 V~2.4 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
±
1.5 ppm.