| 摘要 |
<p>PROBLEM TO BE SOLVED: To correct the variance of pulse width due to the manufacturing variance of a pulse generation circuit and also to change the pulse width by providing a comparator to compare the node potential of a charge/discharge circuit with the reference voltage, feeding the output signal of the comparator back to a flip-flop, and also changing the reference voltage to generate a one- shot pulse of desired width. SOLUTION: The inverted output QN of a flip-flop FF1 falls synchronously with the rise of an input signal, and a switch MOSFET MN1 is turned off. Then the capacitance C1 is charged and the potential of a node A gradually rises. When the potential of the node A exceeds a reference voltage Vr, the output signal of a comparator CMP is changed to a high level from a low level. Then the FF1 is cleared. As a result, a one-shot pulse having the prescribed width that is decided by the capacity C1, the current I of a constant current source C1 and the level of the voltage Vr is generated at a non-inverted output terminal Q of the FF1.</p> |
