US Patent 7800432 Semiconductor circuit and controlling method thereof

A semiconductor circuit including a bias circuit (1) generating a signal reflecting a current driving capability of a transistor; an analog/digital converter circuit (2) converting the signal from an analog format into a digital format; and a signal processing circuit (3) partially controlled in an operating state or a non-operating state according to the signal converted by the analog/digital converter circuit as a control signal, is provided.