Intermediate frequency receivers
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United States of America Patent
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N/A
Issued Date -
Mar 1, 2007
app pub date -
Aug 23, 2006
filing date -
Aug 23, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
There is provided an apparatus and method for isolating an in-phase component I and a quadrature component Q of a received IF signal and for filtering the received signal. The apparatus comprises a DDC for sampling the received signal at four times the frequency of the received signal, each sample having an order k and a filter for reducing noise outside a required bandwidth. The filter has n taps and comprises a first filter portion for receiving the samples where k is even and for outputting an in-phase component I of the received signal and a second filter portion for receiving the samples where k is odd and for outputting a quadrature component Q of the received signal. The first filter portion has x taps and the second filter portion has y taps and x+y=n.
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