Adjustable electronic duplexer
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United States of America Patent
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Feb 12, 2008
Grant Date -
Sep 18, 2003
app pub date -
Dec 9, 2002
filing date -
Dec 7, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A duplexer for a communication device having a transmission unit, a reception unit and a shared antenna is disclosed. The duplexer comprises a first signal path between the transmission unit and the reception unit, the first signal path comprises a filter unit filtering the reception signal, the filtering unit provides a filtered signal to the reception unit. The duplexer further comprises a second signal path between the transmission unit and the reception unit. The second signal path comprises a cancellation unit which receives a sample of the transmission signal and produces a compensation signal. The injection of the compensation signal to the first signal path reduces the leakage signal, thereby producing a substantially leakage-free reception signal.
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