In one example, a power-on reset (POR) circuit comprises a first transistor coupled to a voltage source, a control terminal of the first transistor coupled to a non-control terminal of the first transistor via a resistor； a second transistor coupled to the resistor, a control terminal of the second transistor is coupled to a non-control terminal of the second transistor； and a comparator having first and second terminals, the first terminal coupled to the non-control terminal of the first transistor and the second terminal coupled to the voltage source via an offset circuit.
