Patent ID: 7378943

Claim:
A noise suppressing circuit that is inserted somewhere along two conductive lines connected to a noise source and that suppresses noise emerging from the noise source and propagating through the conductive lines, the noise suppressing circuit comprising: a first noise reducing circuit for reducing noise mainly in a first frequency range; and a second noise reducing circuit for reducing noise mainly in a second frequency range including frequencies lower than frequencies in the first frequency range, wherein the first noise reducing circuit incorporates: a detection means disposed in a specific location along the conductive lines and detecting noise propagating through the conductive lines; a phase-inverted signal generating means for generating a phase-inverted signal that has a phase opposite to a phase of the noise detected by the detection means; and a noise canceling means disposed in a location different from the location of the detection means along the conductive lines and injecting the phase-inverted signal generated by the phase-inverted signal generating means into the conductive lines to cancel out the noise on the conductive lines.