| 摘要 |
<p>PURPOSE:To control independently the rise time and the fall time of a CMOS logic circuit by inserting variable resistance elements controlled from mutually independent external terminals, in an power supply route and a grounding route of the CMOS logic circuit. CONSTITUTION:An internal inverter circuit is constituted of a CMOS inverter circuit, N-channel or P-channel MOS Tr 3 and Tr 4. In the CMOS inverter circuit, gates of a P-channel MOS Tr 1 and an N-channel MOS transistor Tr 2 are mutually connected, and drains of the transistors are mutually connected. The above node-points are made the logic input and the logic output, respectively. The MOS Tr 3 and Tr 4 are inserted, respectively, in the power supply side and the grounding side of the CMOS inverter circuit. The Tr 3 and the Tr 4 are used as variable resistance elements, and the gates of them are connected with the external input terminals 5 and 6, respectively. By voltages independently applied to the external input terminals 5, 6, characteristics of the rise time and the fall time of output voltage can be independently controlled.</p> |
