Handset-PA Duplexer Interaction When the Isolator is Eliminated

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  • Author: Raymond W. Waugh
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.