Patent ID: 6559708
Filing Date: 2003-05-06
Classification: H03K

Abstract:
A semiconductor integrated circuit comprising:a first virtual power supply line; first backgate power supply line; power supply switch circuitry at least including a first field effect transistor including one source/drain electrode for receiving a first power supply voltage, the other source/drain electrode connected to said first virtual power supply line, and a gate electrode for receiving a control signal for controlling ON/OFF of said transistor, and a second field effect transistor, having one source/drain electrode connected to said first virtual power supply line and the other source/drain electrode connected to said first backgate power supply line, to be turned on when said first field effect transistor is turned on; and circuitry including a third field effect transistor having one source/drain electrode connected to said first virtual power supply line and a backgate electrode connected to said first backgate power supply line wherein said first field effect transistor and said second field effect transistor are connected in series between a node for receiving said first power supply voltage and said first backgate power supply line.