Off-Chip Rf Components - LG E900 Service Manual

3. TECHNICAL BRIEF

3.5 OFF-CHIP RF COMPONENTS

3.5.1 RF2815(U105:GPS LNA)
The RF2815 is an LNA module, with integrated filter, designed for GPS band applications at 1.575GHz. The
LNA uses RFMD Technologies' proprietary GaAs Enhancement-mode pHEMT process to achieve high gain
with very low noise figure and high linearity Noise figure distribution is very tightly controlled. A CMOS-
compatible shutdown pin is included either for turning the LNA on/off, or for current adjustment. The RF2815
is useable down to 1V operation. It achieves low noise figure, high gain and linearity even at 1V, making it
suitable for use in critical low-power GPS applications or during low-battery situations.
3.5.2 SKY77544(U104:FEM + GSM Quad-Band PAM)
SKY77544 is transmit and receive Front End Module(FEM) designed in a very low profile (1mm), compact
form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation – a
complete transmit VCO-to-Antenna and Antenna-to- receive SAW filter solution. The FEM also supports Class
12 General Packet Radio Service (GPRS) multi-slot operation and EDGE Polar Modulation. WCDMA switch-
through support is provided by three dedicated high-linearity ports.
LGE Internal Use Only
[Table 1] Antenna Switch Module Logic
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