Method and apparatus for signal power loss reduction in RF communication systems
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United States of America Patent
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Nov 27, 2012
Grant Date -
Mar 29, 2007
app pub date -
Nov 13, 2006
filing date -
Aug 13, 2002
priority date (Note) -
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Abstract
Multiple power amplifiers in an RF front end are coupled to multiple antennas without diversity switching between the PAs and antennas. Diversity switches direct signals to broadcast by a selected antenna to a PA coupled to the selected antenna. Multiple LNAs are similarly coupled to the diverse antennas. Having one PA and LNA set for each antenna removes the need for diversity switching between the PA/LNAs and each antenna improving signal reception. In one embodiment, a single external PA performs broadcast functions and plural on-chip LNAs are used for reception. In another embodiment, phase shifters are coupled to each PA and LNA, which provide beam forming capability for broadcasts, and in phase signal combinations for received signals.
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