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Power supply voltage controlling circuit for use in subthreshold digital CMOS circuit including minute current generator and controlled output voltage generator circuit
Power supply voltage controlling circuit for use in subthreshold digital CMOS circuit including minute current generator and controlled output voltage generator circuit
In a circuit and method for correcting a delay variation of a subthreshold CMOS circuit operating in a subthreshold region, a power supply voltage controlling circuit is provided for supplying a controlled output voltage to a subthreshold digital CMOS circuit as a controlled power supply voltage. The subthreshold digital CMOS circuit includes CMOS circuits each having a pMOSFET and an nMOSFET and operating in a subthreshold region with a predetermined delay time, and further includes a minute current generator circuit generating a predetermined minute current based on a power supply voltage, and a controlled output voltage generator circuit generating a controlled output voltage for correcting a variation in the delay time based on a generated minute current and supplying the controlled output voltage to the subthreshold digital CMOS circuit as a controlled power supply voltage including a change in each threshold voltage of the pMOSFET and the nMOSFET.
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