User's Manual

Telit GE863-GPS
Hardware User guide
1vv0300714, Rev. ISSUE#0, - 21/02/06
Reproduction forbidden without Telit Communication written authorization – All Right reserved – Right of modification reserved page 21 of 76
Linear antennas Suppliers:
• Filtronic - new (England)
• FDK DA-5T26-new (Japan)
• Kyocera GPS and GPS+BT (Japan)
• Murata (Japan)
• Taiyo-Yuden-new (Japan)
• Others like Tyco or custom designs
Patch Antennas Suppliers:
• FDK
• Kyocera
• Murata
• KDI (Korea)
4.4.3 LNA and Front End Design Considerations
LNA gain should be between 12 dB and 26 dB (assumes a patch antenna).
– This assumes the patch used has >3 dBic of gain
Linear antenna implementation should consider a minimum of ~14.5 dB of LNA gain.
Excessive LNA gain (>27 dB) can introduce jamming spurs, degrade 3IP, and saturate the
receiver.
Latest LNAs available with shaped gain response capabilities:
• With Shutdown:
1. Infineon BGA615L7
2. NEC μPC8211
• Without Shutdown:
1. Infineon BGA 428
2. ATMEL ATR0610
3. JRC NJG1107
In highly integrated environments rich with potential interference, SiRF suggests design
implementations with PRE filters.
The module input has already a SAW filter.