| 摘要 |
PURPOSE:To realize delay attachment in which dispersion between the chips of a delay circuit formed on a semiconductor substrate can be remarkably suppressed. CONSTITUTION:A unit time signal with time width T is inputted to a first selection circuit 2. Delay is applied to (n) delay elements 1-1 to 1-n comprising a delay element group one by one by such input. and the output of either the delay elements which supply desired delay quantity is selected at a second selection circuit 9. A counter circuit 5 monitors the output of each delay element, and counts only the output of same high level, and supplies it to a first memory circuit 6. The first memory circuit 6 inputs the unit time signal 4, and stores and outputs the output of the counter circuit 5 set at a high level at the timing of trailing edge of the signal. A second memory circuit stores the desired delay quantity as NT, and the second selection circuit 9 decides the output stage of the delay element representing the delay quantity of NT based on the output of the delay circuit which offers the time width T outputted from the first memory circuit 6 and information offered from the second memory circuit 7, and outputs an input signal from the delay element at the delay stage. |
