Ladder filter, analog equalizer and signal readout system
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United States of America Patent
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Sep 18, 2007
Grant Date -
Apr 15, 2004
app pub date -
Oct 8, 2003
filing date -
Jun 15, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A ladder filter includes multiple inductor sections, each including voltage-controlled current sources and capacitors. A second signal input terminal is provided for the filter separately from an ordinary signal input terminal and a signal, which has been input through the second terminal, is supplied to one of the voltage-controlled current sources by way of a gain calculator. By adjusting the gain obtained by the gain calculator to an appropriate value, the ladder filter can make the numerator of its transfer function freely definable.
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