PX8700
LG Electronics Inc.
- 32 -
z
RFT6150 Cellular and PCS CDMA RF Specifications
Parameter
Condition
Min.
Type.
Max.
Units
Rated Output Power
Average CDMA Cellular
Average CDMA PCS
8
10
dBm
dBm
Min Output Power
Average CDMA Cellular
Average CDMA PCS
-80
-78
dBm
dBm
RX band noise power
CDMA Cellular
CDMA PCS
-133
-132
dBm/Hz
ACPR
Cellular: Fc
±
885kHz
PCS : Fc
±
1.25MHz
-56
-56
dBc/
30kHz
1.3.2 Power Amplifier(U108)
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
+17dBm and conversion gain is about 28dB. 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 Voltage Control Temperature Compensation Crystal Oscillator (VCTCXO, X101)
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.
Summary of Contents for PX8700
Page 40: ...PX8700 LG Electronics Inc 40 Circuit Diagram ...
Page 45: ...PX8700 LG Electronics Inc 45 Circuit ...
Page 51: ...PX8700 LG Electronics Inc 51 Circuit Diagram ...
Page 56: ...PX8700 LG Electronics Inc 56 Circuit ...
Page 62: ...PX8700 LG Electronics Inc 62 Circuit Diagram RFT6150 PMIC 2 9V_TX 2 6V_MSMP2 circuit ...
Page 70: ...PX8700 LG Electronics Inc 70 RF_IN Graph 4 2 1 6 RF_OUT Circuit Diagram Waveform ...
Page 84: ...PX8700 LG Electronics Inc 84 Graph 4 2 2 5 RF_OUT RF_IN Waveform Circuit Diagram ...
Page 90: ...4 3 1 2 Charging Trouble Circuit Diagram Test Points V_BATT Pin1 CON401 U402 ...
Page 98: ...4 3 4 2 Receiver Trouble Test Points Circuit Diagram R314 U305 R315 C338 ...
Page 100: ...4 3 4 4 Headset Trouble Circuit Diagram Test Points CON402 R405 R416 R415 C116 C115 ...
Page 103: ...4 3 4 3 Mic Trouble Circuit Diagram Test Points R126 M101 ...
Page 110: ...4 3 6 3 USB Interface Circuit Diagram U201 MSM6550 U302 Test Points R307 X202 R306 L302 C314 ...
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Page 130: ...MSM6550 P N MSM6550 R N U201 No Booting Memory P N HYG0UGG0MF1P 5SH0E R N U304 No Booting ...
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