Front end module with tone injection
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United States of America Patent
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Aug 11, 2015
Grant Date -
Dec 26, 2013
app pub date -
Aug 28, 2013
filing date -
Jun 3, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A radio front end includes a power amplifier, a tone injection module, a duplexer, a balancing network, and a processor. The tone injection module is operable, in a first mode, to produce a tone having a carrier frequency that is substantially similar to a carrier frequency of an inbound wireless signal. The duplexer is operable, in the first mode, to provide electrical isolation between the outbound wireless signal and a combination signal of the tone and inbound wireless signal and is operable, in a second mode, to provide electrical isolation between the outbound wireless signal and the inbound wireless signal. The processor is operable to determine an amplitude of a tone component of the combination signal; correlate the amplitude of the tone component to an inbound frequency band isolation; and adjust baseband processing of a down converted representation of the combination signal based on the inbound frequency band isolation.
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