| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply ripple reducing circuit capable of reducing any ripple voltage on a DC power supply line without reducing the power supply voltage on the DC power supply line. <P>SOLUTION: A power supply ripple reducing circuit comprises extracting means (DC obstructing capacitor C3) for extracting any ripple voltage contained in the power supply voltage on a DC power supply line LN1 and inversion-amplifying means (an amplifier comprising voltage dividing resistors R2 and R3, a capacitor C4, resistors R4 and R5, and an operational amplifier OP1, and a DC obstructing capacitor C5) for inversion-amplifying the ripple voltage extracted by the extracting means, in which the ripple voltage on the DC power supply line LN1 is reduced by returning the ripple voltage inversion-amplified by the inversion-amplifying means to the DC power supply line LN1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
