Patent ID: 8247925

Claim:
A power source stabilization circuit provided within a chip of an electronic device, the power source stabilization circuit stabilizing a power source voltage supplied to an operational circuit of the electronic device, the power source stabilization circuit comprising: an amplifier that detects a fluctuation component in the power source voltage occurring in a main power source wiring used to supply the power source voltage to the operational circuit, amplifies the detected fluctuation component, and outputs the amplified fluctuation component; and a stabilization capacitor that is provided between an output end of the amplifier and the main power source wiring and supplies to the main power source wiring a current to reduce fluctuation in the power source voltage occurring in the main power source wiring, in accordance with the output from the amplifier, wherein a power source voltage supplied to the amplifier is supplied from a different power source system than the power source voltage supplied to the operational circuit, the power source voltage supplied to the amplifier is different from the power source voltage supplied to the operational circuit, and the power source voltage supplied to the amplifier is approximately equal to a result of multiplying the fluctuation component in the power source voltage supplied to the operational circuit by an expected amplification ratio of the amplifier.