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LEON-G100/G200 - System Integration Manual
1.7 RF connection
The core of the RF part of the LEON-G100/G200 modules is the transceiver integrated in the GSM/GPRS single
chip. The integrated receiver covers the four GSM bands GSM850 MHz, EGSM900 MHz, DCS1800 MHz and
PCS1900 MHz, using two LNAs integrated in the RF Transceiver and providing quad-band operation. In the first
duplexer the two low bands (RX path 850 MHz and 900 MHz) are separated, filtered, and routed to a single
output and then connected to the LNA of the first low band receiver. In the same way the two high bands (RX
paths 1800 MHz and 1900 MHz) are connected to the second duplexer to LNA of the second high band
receiver.
Two different RF TX outputs are provided, one for 850/900 MHz bands and one for 1800/1900 MHz bands. The
quad-band front end module amplifies these signals maintaining two separate paths.
By default the RF I/O signal is routed through a 50 Ω antenna interface.
The temperature dependent performance of the oscillator and RF high power circuits are controlled by the
baseband with the aid of the NTC sensor.
1.8 Antenna supervisor
Antenna detection is internally performed by the module via ANT: the RF port is DC coupled to the ADC unit in
the baseband chip. The module measures the DC voltage at ANT, in the range of 0..2 V. Additionally, the
module can inject a known DC current (~ 100 µA) on ANT and measures the resulting DC voltage.
DC
Blocking
ANT
RF Transceriver
RF
Choke
A-to-D
Converter
Current
Source
LEON-G100
LEON-G200
Figure 18: Antenna Supervisor internal circuit
If the DC voltage is present on ANT, or a DC connection to a known resistor at the radiating element is
implemented, the module will be able to check the connection to the Antenna element.
Refer to the u-blox AT Commands Manual [2] for more details on how to access this feature.
1.9 Audio
LEON-G100/G200 modules provide four analog and one digital audio interfaces:
Two microphone inputs:
First microphone input: direct connection of an electret condenser microphone, used in the handset mode or
in the hands free mode
GSM.G1-HW-09002-C
Preliminary
System description
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