| 摘要 |
PURPOSE:To stabilize a power supply voltage of a circuit unit even at load, by connecting a switch and a capacitor between the circuit unit consisting of an LSI and the like, a power supply and a load driving circuit. CONSTITUTION:A capacitor 11 is connected between a power supply voltage supply terminal V'ss of an LSI1 and ground Vdd, and a switch 12 is inserted to a DC voltage supply path between a connecting point of the capacitor 11 and the power supply voltage terminal of the LSI1 and a connecting point of a battery 2 and a load driving circuit 3. A clock phi and the frequency of a load driving signal A are matched. But the fall of the clock phi has a little delay than the fall of the signal A. At the fluctuation of a power supply Vss, the capacitor 11 is discharged to the LSI1, then the fluctuation of the Vss is not given to the LSI1, the V'ss is made constant to stably operate the LSI1. |
