SUPPRESSION CIRCUIT FOR SUPPRESSING UNWANTED TRANSMITTER OUTPUT
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United States of America Patent
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Issued Date -
Aug 21, 2014
app pub date -
Feb 18, 2014
filing date -
Feb 19, 2013
priority date (Note) -
Abandoned
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Abstract
Aspects of the disclosure relate to a frequency suppression circuit arrangement, which allows at least one selected frequency band to be suppressed by coupling the frequency suppression circuit between the input and output of an RF power amplifier. The frequency circuit in the embodiments of the disclosure down-converts a feedback signal derived from the amplified output signal into baseband signals. Each of the baseband signals is fed into an inverting amplifier to generate a negative baseband signal. The negative baseband signal is subsequently filtered to selectively pass the negative baseband signal. The filtered signal is subsequently up-converted into an RF signal. The up-converted RF signal is combined and provided to a coupler connected at the input of the power amplifier such that when the input signal is amplified by the RF power amplifier any signals at the selected frequency can be suppressed.
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