| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a class D amplification circuit that reliably cancels effects of power pumping. <P>SOLUTION: A capacitor 62 is charged with a current between a supply voltage VDD and a ground when a first switch 61 is on and a second switch 63 is off, and a voltage of the capacitor 62 is compared with a reference voltage Vr in a comparator 64 when the first switch 61 is off and the second switch 63 is on. An output of the comparator 64 is input into a power limit circuit 30, which limits the pulse width of output signals from a PWM modulation circuit 20 if the voltage of the capacitor 62 exceeds the reference voltage Vr. <P>COPYRIGHT: (C)2013,JPO&INPIT |
