Down/up-conversion apparatus and method
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United States of America Patent
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Aug 26, 2003
Grant Date -
N/A
app pub date -
Oct 2, 1998
filing date -
Oct 3, 1997
priority date (Note) -
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Abstract
A down-converter converts an amplitude modulated high frequency signal into a low frequency or baseband signal. A first mixer (30, 32) mixes the high frequency signal into a composite signal having an in-phase component and a quadrature component. A complex bandpass filter (34) bandwidth limits the composite signal into a bandwidth limited signal with an in-phase component and a quadrature component. A second mixer (36, 38) mixes the bandwidth limited signal into an intermediate signal with an in-phase component and a quadrature component, and an adder (40) adds one component of the intermediate signal to the other. A similar up-converter performs the reverse process.
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