| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-pass filter for D-class amplifier output that has superior channel separation, at the same time, can be miniaturized, and can be packaged with high density in an adjacent signal amplification channel. SOLUTION: Induced electromotive force due to leak flux from an adjacent channel is canceled by a pair of inductors at an adjacent stage in the low-pass filter 1. Concretely, the low-pass filter of each channel is set to the same configuration and circuit, the coil center of two corresponding pairs of inductors in the adjacent channels is arranged so that the coil center axis becomes each vertex of a right-angled parallelogram, and at the same time combination in the coil winding direction of a corresponding inductor between the adjacent channels is set to the same and opposite directions in every other inductor.
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