Frequency agile filter using a digital filter and bandstop filtering
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United States of America Patent
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Feb 26, 2013
Grant Date -
Sep 22, 2011
app pub date -
Nov 26, 2009
filing date -
Dec 1, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a hybrid RF-digital signal processor-based filter for multiband radio architectures systems capable of spectrum re-farming and software defined radios. It performs low-loss frequency agile multiple notch filtering at RF where a large dynamic range exists at a filter input between signals in a stopband and passband. It is a frequency dependent signal attenuation apparatus having two paths connected together by directional couplers. The first path comprising a component such as a delay component or duplexer. The second path comprising a bandstop filter connected to a down converter, a digital filter, and an up converter. At the output of a power amplifier, the invention can be used to attenuate spurs, or noise within bands with strict emission constraints. At the input of a low noise amplifier, the invention can be used to attenuate blockers and transmitter noise outside of the receiver passband.
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