Hisense EG59, Техническое руководство, Страница: 6 / 13

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CDMA:
Item Content Comment
Frequency band
CELL
：
869~ 894MHz
Channel bandwidth 1.23MHz
Receiver sensitivity < –104dBm (FER:0.5%)
Single Frequency
Interference Resist < –101dBm (FER: 1.0%) Frequency
offset: 900KHz
Power: -30dBm
Frequency offset: ±0.9MHz/±1.7MHz, Power:
①
-
43dBm
Frequency offset: ±0.9MHz/±1.7MHz, Power:
②
-
32dBm
Inter-modulation
spurious response
attenuation
Frequency offset: ±0.9MHz/±1.7MHz, Power:
③
-
21dBm
<
①
–81dBm Conductibility
spurious emission
<
②
–61dBm
3.3. Other Electronic Specifications
SIM / UIM interface, Support either 3V or 1.8V
4. Phone Work Principles
4.1 RF circuit
4.1.1 RF circuit of CDMA
4.1.1.1Main functions of RF circuit:
The baseband CDMA signal is modulated by transmitting circuit, and
then is transmitted by antenna on the bandwidth: 824MHz~849MHz;
When the receiver circuit receives the signal on 869MHz~894MHz, it is
demodulated and becomes to the forward channel baseband CDMA
signal; and at the same time, provides the constant controllable
19.2MHz frequency source.
4.1.1.2 Structure of RF circuit:
We could divide it to 4 units according to the functions: Antenna unit,