| 摘要 |
PROBLEM TO BE SOLVED: To provide a delay circuit for synchronizing phases of an input signal and an output signal independently of a power supply voltage. SOLUTION: The delay circuit is provided with a capacitor 18 in which a power supply voltage is applied to one end only when the input signal A is high, a constant current circuit 17 connected to one end of the capacitor 18 only when the input signal A is changed to low, and to gradually reduce the voltage of the one end of the capacitor 18 from a power supply voltage, and a PMOS transistor 14 which operates so as to change an output signal E to low when voltage equivalent to the voltage drop is equal to or greater than the absolute value of a threshold voltage due to the lapse of a prescribed delay time after the input signal A is changed to low. COPYRIGHT: (C)2009,JPO&INPIT
|
