COMPOSITE BAND-PASS FILTER AND METHOD OF FILTERING QUADRATURE SIGNALS
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United States of America Patent
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Issued Date -
Apr 23, 2009
app pub date -
Mar 17, 2006
filing date -
Mar 17, 2006
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Abandoned
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Abstract
A composite band-pass filter receives a quadrature input signal and passes an intermediate frequency signal while attenuating all other signals including an undesired image signal. The composite band-pass filter is comprised of a continuous time polyphase filter and a discrete time polyphase filter and can amplify signals. The amplification is distributed through out the composite band-pass filter and the amount of amplification may be selected by control signals. The composite band-pass filter has improved dynamic range and noise characteristics, selectable amplification and replaces an external crystal filter.
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