| 摘要 |
PROBLEM TO BE SOLVED: To provide a reference current source circuit that outputs a constant reference current, even if surrounding environments such as temperature and power supply voltage change, in a power supply circuit operated in a minute current region in an order of nanoamperes. SOLUTION: The reference current source circuit includes: an nMOS-configured power supply circuit 11, 21 which includes a current generating nMOSFET, and generates a first current having temperature characteristics of an output current dependent on an electron mobility; a pMOS-configured power supply circuit 12, 22 which includes a current generating pMOSFET, and generates a second current having temperature characteristics of an output current dependent on a hole mobility; and a current subtracter circuit 13 which generates a constant reference current by subtracting the second current from the first current. COPYRIGHT: (C)2011,JPO&INPIT
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