Maxon Electronics Australia Pty. Ltd. MM-5500SU 사용자 설명서
FCC Documentation
MM-5500SU CDMA 1X/EVDO Modem
17/17
Confidential and proprietary information.
This document is the sole and exclusive property of Maxon Australia.
Not to be distributed or divulged without prior written agreement.
This document is the sole and exclusive property of Maxon Australia.
Not to be distributed or divulged without prior written agreement.
5.6.1.1
Frequency synthesizing Part (for CDMA Engine)
Frequency synthesizing part called PLL Synthesizer consists of three synthesizer circuit which
is first local synthesizer, Tx IF synthesizer and Rx IF synthesizer. The first local synthesizer
generates the primary local system oscillation frequency, operating over 1372.08 ~ 1419.54
MHz frequency range. Tx IF and Rx IF synthesizer generate the second local oscillation
frequency, 267.2 MHz and 367.2 MHz respectively.
5.6.1.2
Receiving Part (for CDMA Engine)
- Duplexer. The duplexer filters the RF signal transmitted through Antenna and sends the
signals to LNA.
- LNA. This part in front-end is used to amplify the received signal with low noise figure
- Down converter. It acts as a mixer using first local frequency to produce the desired signal
in the mid-range frequency of 183.6 MHz.
- Rx AGC. This part is designed to control the gain of the dynamic range of midrange
frequency produced in down converter according 80 dB dynamic range.
Currently, previous BBA is divided into S1M8656A(Rx IF-baseband converter) and
RFT3100(Tx baseband-IF converter). S1M8656A acts as the baseband analog processor
which processing the signals between the S1M8656A and digital processing circuit.
In the while, RFT3100 consists of Tx AGC and Tx part analog processor of previous BBA.
5.6.1.3
Transmission Part (for CDMA Engine)
- Tx AGC. It is designed to be gain-controlled from 84 dB dynamic range. The gain of this
part is controlled by MSM using digital control signal.
- Up converter. This part mixes the IF transmission frequency 138.6 MHz and the first local
1372.08 ~ 1419.54 MHz to generate transmission frequency of 824.64 ~ 848.37 MHz.
- Power AMP module. This part is designed to work in 824 MHz ~ 849 MHz frequency range
in the CDMA mode and can generate the proper output power. The DC voltage and current
supplied into the power amp module is typical 3.75V and 0.3A. In this CDMA Engine, power
AMP is directly activated using internal DC/DC converter output voltage.