Method and apparatus for DC offset removal in a radio frequency communication channel
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United States of America Patent
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Dec 13, 2005
Grant Date -
Dec 4, 2003
app pub date -
Nov 8, 2002
filing date -
Jun 4, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A filter module for reducing a DC offset voltage in a radio frequency communication channel is described. A first capacitor is coupled between a first differential input node and a first differential output node. A second capacitor is coupled between a second differential input node and a second differential output node. An active variable resistor is coupled between the first differential output node and the second differential output node. The active variable resistor receives a control signal. The control signal adjusts the value of the active variable resistor, which adjusts the frequency response of the filter module. The rate at which the filter module reduces DC offset voltages is thereby adjusted. The filter module is also adaptable to single-ended applications.
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