| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To generate a pulse signal with a cycle longer than that of a clock signal oscillated by an oscillation circuit. <P>SOLUTION: When an output of a comparator 100 is at high level, a transistor 130 is in an ON state, a capacitor 170 is charged by a DC power source in accordance with a signal level of an input signal A, a capacitor 180 is charged by the capacitor 170, and thus the value of a signal C is gradually increased. When the value of the signal C reaches the potential of a non-inverted input terminal of the comparator 100, the output of the comparator 100 is turned to low level. When the output of the comparator 100 is at low level, a transistor 140 is in the ON state, charges of the capacitor 170 are discharged to a ground plate in accordance with the signal level of the input signal A, charges of the capacitor 180 are transferred to the capacitor 170, and thus the value of the signal C is gradually decreased. When the value of the signal C reaches the potential of the non-inverted input terminal of the comparator 100, the output of the comparator 100 is turned to high level. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
