Tunable radio frequency filtering circuitry
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United States of America Patent
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Jun 12, 2018
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N/A
app pub date -
Aug 8, 2016
filing date -
Sep 18, 2015
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Abstract
Radio frequency (RF) filtering circuitry includes transmit signal filtering circuitry and receive signal filtering circuitry. The RF filtering circuitry is configured to separate RF transmit signals within a transmit signal frequency band from RF receive signals within a receive signal frequency band. A tunable impedance is coupled to the transmit signal filtering circuitry and adjusted such that the attenuation of the RF transmit signals is greater in a first portion of the receive signal frequency band than in a second portion of the receive signal frequency band in a first mode of operation, and greater in the second portion of the receive signal frequency band than in the first portion of the receive signal frequency band in a second mode of operation.
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