我很菜鳥.
要把一個正方波信號的下降沿縮短,怎么用電路實現呢?
         ________________                   ____________
A:       |              |                   |
---------               --------------------
         _____________                      ____________
B:       |           |                      |
----------           ------------------------

就是要把上面的A變成下面的B.
大家幫幫忙,謝謝!