| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately detect a pumping phenomenon of a supply voltage and a DC component of an output voltage in a simple circuit configuration. <P>SOLUTION: A transistor Q1 combines the function of detecting a positive DC voltage included in an output voltage of a switching amplifier and the function of detecting a pumping phenomenon occurring in a positive supply voltage +VB. A transistor Q2 combines the function of detecting a negative DC voltage included in the output voltage of the switching amplifier and the function of detecting a pumping phenomenon occurring in a negative supply voltage -VB. Zener diodes D1, D2 are both off when there occurs no pumping phenomenon. Resistances R4, R5 can thus prevent the accuracy of DC voltage detection from degrading. <P>COPYRIGHT: (C)2013,JPO&INPIT |
