Baseband filter for receivers
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United States of America Patent
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Mar 9, 2004
Grant Date -
N/A
app pub date -
Jan 13, 2003
filing date -
Jan 13, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A filter circuit. In one embodiment, the filter circuit includes a continuous time (CT) filter, a switched capacitor (SWC) filter, and an SWC integrator. The CT filter is coupled to receive an input signal from an external source. The CT filter may be a low-pass filter. The SWC filter is coupled to receive an output signal from the CT filter, and provide an output information signal. The SWC filter may also be a low pass filter. A feedback loop may be present between the output of the SWC filter and the input of the CT filter. The SWC integrator samples the output signal from the SWC filter and provides an output signal to the CT filter. The output signal is combined with the input signal to the CT filter. A D.C. offset may be substantially removed from the information signal provided by the output of the SWC filter.
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