Reference current source circuit provided with plural power source circuits having temperature characteristics
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United States of America Patent
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Nov 6, 2012
Grant Date -
Sep 9, 2010
app pub date -
Feb 26, 2010
filing date -
Mar 2, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A reference current source circuit outputs a constant reference current even if surrounding environments such as temperature and power source voltage change in a power source circuit that operates in a minute current region in an order of nanoamperes. The reference current source circuit includes an nMOS-configured power source circuit, a pMOS-configured power source circuit, and a current subtracter circuit. The nMOS-configured power source circuit includes a current generating nMOSFET, and generates a first current having temperature characteristics of an output current dependent on an electron mobility. The pMOS-configured power source circuit includes a current generating pMOSFET, and generates a second current having temperature characteristics of an output current dependent on a hole mobility. The current subtracter circuit generates a constant reference current by subtracting the second current from the first current.
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