LG RD3500, Service Manual

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LG- K D3500
LGE
LG Electronics Inc.
17/21
Condition Min. Typ. Max. Unit
Maximum Output Power 28 dBm
Noise power 869-894 MHz, all power
levels
-135.0 dBm/Hz
ACPR
±
885kHz, < 2:1 VSWR
±
1.98MHz, < 2:1 VSWR
-44
-57
dBc
dBc
1.3.2 Power Amplifier (U102)
The power amplifier that can be used in the CDMA mode has linear amplification capability.
For higher efficiency, it is made up of one module (Monolithic Microwave Integrated Circuit) for which
RF input terminal and internal interface circuit are integrated onto one IC after going through the GaAs
HBT (heterojunction bipolar transistor) process.
The module of power amplifier is made up of an output end interface circuit including this module.
The maximum power that can be inputted through the input terminal is 8dBm and conversion gain is
about 28.5dB. RF transmit signals that have been amplified through the power amplifier are sent to
the duplexer.
1.4 Description of Frequency Synthesizer Circuit
1.4.1 Crystal Oscillator (X202)
Crystal Unit generates the refrence frequency of 19.2MHz. Tolerance at 25
°
C is
±
12x10
-6
Max.Tolerance over the tmperature range is
±
12x10
-6
Max. at -30 to 85
°
C