NOISE BYPASS CIRCUIT, PRINTED BOARD AND ELECTRONIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a noise bypass circuit that has a high noise bypass effect at various frequencies.SOLUTION: A bypass section (10) of the noise bypass circuit (100) includes a switch (SW) for switching an element connected to the circuit such that a frequency characteristic of impedance between a printed board and an external conductor part changes. A bypass amount detection section (20) successively detects a current (bypass amount) flowing through the bypass section. The switch is changed over so as to increase the bypass mount on the basis of the bypass amount detected by the bypass amount detection section. The impedance of the bypass section can thus cope with noise present at various frequencies.