Variable resistor, filter, variable gain amplifier and integrated circuit using the variable resistor
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United States of America Patent
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Jul 6, 2010
Grant Date -
Feb 12, 2009
app pub date -
Aug 6, 2008
filing date -
Aug 9, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A variable resistor formed on a silicon substrate, and changing a resistance value between an input terminal and an output terminal, includes a plurality of first resistors each having one end connected in common to the input terminal, and each having other end, a plurality of second resistors each having a resistance value smaller than the first resistors, and each having one end connected to the other end of any one of the first resistors, and a switch group interposed between the input terminal and the output terminal, and selecting one from the first resistors, and further, selecting at least one from the second resistors connected to the other end of the selected first resistor.
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