Handset-PA Duplexer Interaction When the Isolator is Eliminated
In many of today’s CDMA handsets, the last three components in the transmit chain are the power amplifier, duplexer and antenna. Because of space limita-tions in the smallest handsets, there is no room for the isolator tra-ditionally found between PA and duplexer. Because the antenna, duplexer and power amplifier interact strongly with each other, the elimination of the isolator creates more work for the handset designer.
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