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WM_PRJ_Q2686_PTS_001-010
June 30, 2009
Q2686 Wireless CPU
®
3.23
RF Interface
The impedance is 50
Ω
nominal and the DC impedance is 0
Ω
.
3.23.1
RF Connections
U.FL Connector
A wide variety of cables fitted with U.FL connectors is offered by different
suppliers.
Soldered solution
The soldered solution will preferably be based on an RG178 coaxial cable.
IMP connector
This connector is dedicated to board-to-board applications and must be
soldered on the customer board. The supplier is Radiall (reference: R107
064 900).
Notes:
•
The Q2686 Wireless CPU
®
does not support an antenna switch for a car
kit, but this function can be implemented externally and can be driven
using a GPIO.
•
The antenna cable and connector should be selected in order to
minimize losses in the frequency bands used for GSM 850/900MHz and
1800/1900MHz.
•
0.5dB may be considered as the maximum value of loss between the
Wireless CPU
®
and an external connector.
•
For mounting, assembly and handling of the IMP connector, please
contact the supplier, Radiall, directly. Wavecom cannot provide customer
support for use of this connector.
3.23.2
RF Performance
RF performance is compliant with the ETSI
GSM
05.05 recommendation.
The main Receiver parameters are:
•
GSM850 Reference Sensitivity = -104 dBm Static & TUHigh
•
E-GSM900 Reference Sensitivity = -104 dBm Static & TUHigh
•
DCS1800 Reference Sensitivity = -102 dBm Static & TUHigh
•
PCS1900 Reference Sensitivity = -102 dBm Static & TUHigh
•
Selectivity @ 200 kHz: > +9 dBc
•
Selectivity @ 400 kHz: > +41 dBc
•
Linear dynamic range: 63 dB
•
Co-channel rejection: >= 9 dBc
