Printed wiring board unit for use with electronic apparatus

Abstract

A printed wiring board unit for use with an electronic apparatus in which the unit is formed by a power circuit and a digital circuit. The power circuit is constructed as a power circuit board made of a single-sided board, and the digital circuit is a high density digital circuit board which is smaller than the power circuit board. The digital circuit board is formed into a module by mounting thereon an IC, etc., which operates at the highest internal clock frequency. This reduced digital circuit board is mounted onto the power circuit board with spacing between parts in a layered structure, thereby improving unwanted radiation noise characteristics without increasing costs.

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