| 摘要 |
PURPOSE:To generate a delay signal similar to that by other circuit on the same semiconductor substrate by increasing number of inverter stages connected in series through the nonconduction processing of the internal wire so as to increase the delay time. CONSTITUTION:With connection noes N1, N2 connected together, no signal delay is caused between inverters 1 and 4. In cutting off the wire 7 between the connection nodes N1 and N2 externally by a laser beam, since inverters 1, 2, 3 and 4 are connected in series, the delay time due to the increase in the number of inverter stages is increased. When the operation speed of other circuits formed on one and same semiconductor substrate is changed due to fluctuation of the current drive capability of a transistor, the delay time due to the increased number of inverter stages is increased similarly. Then a node is provided between the inverters 2 and 3 and the circuit connecting two inverters 2 in series is increased similarly by one stage. |
