| 摘要 |
PROBLEM TO BE SOLVED: To effectively reduce the radiation of a noise in a specific frequency band to be generated in a load being the various circuit parts of electronic equipment to the outside without using any coil at the time of supplying a power supply voltage to the load. SOLUTION: This power supply circuit is provided with a current amplifying part 26 for operating a DC power supply voltage from DC voltage generating parts 21, 22 and 23 as an operating power source, a capacitor 27 for supplying an output voltage to be acquired at the output end of the current amplifying part 26 to a load 28, a voltage difference detecting part 30 for generating a difference output corresponding to a difference between the output voltage and a reference voltage to be acquired at the output terminal of the current amplifying part 26 and a feedback path forming part including a frequency selecting part 31 for feeding back a voltage to be acquired from a frequency selecting part 31 to the current amplifying part 26 in response to a difference output from the voltage difference detecting part 30. COPYRIGHT: (C)2006,JPO&NCIPI
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