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A 0.7 μw Explicit Bandgap Less POR Circuit With Brownout Detection

This paper presents a circuit for a power-on reset (POR). It uses a self-control mechanism to have the POR threshold different from the brown out reset (BOR) threshold. The change of threshold voltage happens after the output settles to its high value. It consumes a low current in the steady-state while functioning reliably to detect the BOR condition. It consumes 0.7uW under a 1.8V supply and provides a reliable POR/BOR circuit. Its simple architecture guarantees a good performance that has been verified by measurement. It covers wide supply ramp up and ramp down rates and occupies an area of 8250um2.