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5.1.3. Functional Description
Frequency Plan
The frequency plan is shown below:
E-GSM 900
GSM 1800
GSM 850
GSM 1900
E-GSM 900
GSM 1800
GSM 850
GSM 1900
I
Q
26 MHz
MAIN PLL
5.1.4. Transmitter
Introduction
This section provides a technical description of the transmitter circuits of the Main PCB. A circuit diagram of the whole system is
provided in the Service Manual.
TX Frequency
880 MHz - 915 MHz
1710 MHz - 1785 MHz
824 MHz - 849 MHz
1850 MHz - 1910 MHz
925 MHz - 960 MHz
1805 MHz - 1880 MHz
869 MHz - 894 MHz
1930 MHz - 1990 MHz
90°
M div.
R div.
PFD
Programmable
Main loop filter
N divider
Figure 5.2. Synthesizer Block Diagram
TX IF
98.3 MHz - 114.4 MHz
90.3 MHz - 104.8 MHz
82.42 MHz - 105.55 MHz
97.37 MHz - 112.34 MHz
RX
925.2 MHz -959.8 MHz
1805.2 MHz - 1879.8 MHz
869.2 MHz - 839.8 MHz
1930.2 MHz - 1989.8 MHz
PFD
MAIN VCO 2
@3.80 GHz
MAIN VCO 1
@3.37 GHz
– 5-3 –
TX UHF LO
1474.3 MHz -1543.8 MHz
1354.7 MHz - 1414.5 MHz
1359.93 MHz - 1424.922 MHz
1460.68 MHz - 1516.606 MHz
RX LO
TX LB VCO
= TX GSM850 / GSM900
TX HB VCO
= TX GSM1800 / GSM1900
PAD
L
divider
toward RX mixers
toward PA
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