Frequency offset image rejection
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United States of America Patent
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Nov 6, 2001
Grant Date -
N/A
app pub date -
Jun 29, 1998
filing date -
Jun 29, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An approach for providing image rejection during signal down conversion involves phase shifting quadrature signals at a frequency other than the down converted center frequency. One or more phase shifters coupled to a summer/subtractor provide forty five (45) degrees and one hundred thirty five (135) degrees of phase shift with respect to two quadrature input signals. The one or more phase shifters perform the phase shifts of the quadrature input signals at a frequency other than the center frequency of the down-converted signal.
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