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Circuit Description
2-4. GPS Section
Intenna
Intenna receives a signal from GPS satellites.
It is a tri-band Intenna and covers PCS band, CDMA band and GPS band.
RF Switch
It(U405:TQP4M3018) is used to switch the PCS path and CDMA path and the GPS
path. The RF signal passes through PCS path when PCS_MODE is high(2.6V). The RF signal
passes through CDMA path when CELL_MODE is high(2.6V). The RF signal passes through
GPS path when GPS_MODE is high(2.6V). PCS_MODE, CELL_MODE and GPS_MODE are
digital signals from MSM6500 GPIO.
Low Noise Amplifier(LNA)
The low noise amplifier(Q302:ATF55143) amplifies a weak signal received from the base station to
obtain the optimum signal level.
RF Band Pass Filter(Rx RF SAW Filter)
The RF BPF(F303:DG75BS1) passes only a specific frequency(1575.42±1MHz) from the signal received
from the satellite. The bandwidth is 2 MHz.
2-10
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