| 摘要 |
PURPOSE:To prevent the malfunction of the circuit due to noise on an internal power line by providing a series connection comprising a capacitor and a resistor between a source of a P or N-channel MIS transistor(TR) of an input gate circuit and the 1st or 2nd power supply. CONSTITUTION:A resistor 20(R1) is connected between a source of an N-channel transistor(TR) 14 of an input gate circuit 8 and an internal GND power wire 6. Through the constitution above, the relation of equation I exists among potentials VG, VS, VC, resistors R1, R2, a capacitor C and a current I flowing to the circuit, where VG, VS, VC are potentials of the resistor 20 at the GND side, the potential of the source of the TR14 and the potential of a resistor 22(R2) at the power supply VCC side respectively. Thus, the potential VS is changed by a value divided resistors only with respect to the momentary change in the potentials VG, VC and then traces a slow change. In selecting component values shown in equation II, the fluctuation of the potential VS is suppressed to 1/2 against a noise of several 10ns duration and in the case of R1>R2, the circuit withstands more against noise. |
