Tracking filter for selecting channel of wideband frequency
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United States of America Patent
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May 26, 2009
Grant Date -
Oct 5, 2006
app pub date -
Mar 30, 2006
filing date -
Apr 1, 2005
priority date (Note) -
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Abstract
The present invention relates to a filter, and more particularly, to a tracking filter for selecting a channel of a wideband frequency. The tracking filter for selecting a channel of a wideband frequency, which is for increasing the selectivity of a wideband frequency, includes: a first tracking portion for filtering and amplifying a specific frequency band while converting a low input impedance of the input terminal of the tracking filter into a high impedance; a second tracking portion for maintaining the high impedance of the first tracking portion, and for filtering and amplifying the specific frequency band while increasing the selectivity Q of a frequency outputted from the first tracking portion; and a third tracking portion for filtering the specific band wherein has low input impedance and high output impedance.
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