GPS functionality is added to a wireless communication device in an efficient
and cost effective manner. Briefly, the present invention has a common mixer constructed
to be used for a GPS signal and another signal or a common IF filter constructed
to be used for a GPS signal and another signal. In one embodiment, a common mixer
and IF filter are used for both PCS and GPS signals. In another embodiment, a band
select switch may be used to select either the PCS signal or the GPS signal. Alternatively,
a duplexer or diplexer may couple the GPS signal and the PCS signal to the common
mixer. In this way, a common mixer is enabled to be used for both GPS and PCS.
A dual band local oscillator may be configured to output a local oscillator signal
facilitating selection of a GPS IF signal, a PCS IF signal or a cellular CDMA IF
signal, using a common IF filter. In another embodiment, both the GPS low noise
amplifier (LNA) and the PCS LNA may be switched on and off depending upon whether
GPS or PCS reception is selected.