| 摘要 |
PURPOSE:To obtain a CMOS inverter circuit where a prescribed drive capability is attained and the radiation noise is reduced by combining a first CMOS inverter for rise and fall and a second CMOS inverter for drive capability. CONSTITUTION:A first CMOS inverter INV2 (TP2 and TN2 of small transistor size) for rise and fall and a second CMOS inverter INV1 (TP1 and TN1 of large transistor size) are combined to constitute the circuit. That is, transistors can be divided to transistors for rise and fall and those for drive capability because two kinds of transistor are used. Thus, when an output signal Y rises or falls, TP1 and TN1 are turned off together and rise and fall are controlled by TP2 and TN2 of small transistor size to reduce the radiation noise; and when the output signal Y is in the high or low level, TP1 or TN1 of large transistor size is turned on to secure a prescribed drive capability. |
