Tuning circuit
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United States of America Patent
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Dec 9, 2008
Grant Date -
Dec 28, 2006
app pub date -
Jun 21, 2006
filing date -
Jun 22, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a filter and, more particularly, to a tuning circuit of a filter for correcting a cut-off frequency of the filter. The tuning circuit comprises a current generation unit having a first transistor and a variable resistor unit, and a capacitance correction unit having a second transistor, a capacitor unit, an up-down counter and a selection unit for selecting a control path of the up-down counter for varying the resistance or capacitance.
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