| 摘要 |
PURPOSE:To lower switching noise included in reference voltage by forming a capacitance between a wiring for supplying fixed voltage and a wiring for supplying reference voltage. CONSTITUTION:Internal circuits 31-3n are supplied with reference voltage Vr from a reference-voltage generating circuit 1 through a wiring 2 for supplying reference voltage, but the wiring 2 for supplying reference voltage is connected at fixed potential through a capacitor 4. The capacitor 4 is shaped to the virgin section of the upper section or lower section of a wiring for supplying fixed potential in the longitudinal section of a semiconductor integrated circuit. Accordingly, output impedance from the reference-voltage generating circuit 1 is lowered, and a high-frequency component such as switching noises contained in reference voltage Vr passes through the capacitor 4, thus reducing switching noise included in reference voltage Vr.
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