| 摘要 |
PROBLEM TO BE SOLVED: To reduce the noise of a switching type DC-DC converter that feeds power to transmission/reception circuits. SOLUTION: A band stop filter that corresponds to a frequency range in a difference between a reception frequency band and a transmission frequency band is arranged at an output part of the switching type DC-DC converter that feeds power to the transmission/reception circuits, thus suppressing an influence of noise on the reception frequency band caused by a transmission output of the transmission circuit. COPYRIGHT: (C)2004,JPO&NCIPI
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