Patent ID: 6496886
Filing Date: 2002-12-17
Classification: H01P,H05K

Abstract:
An electronic apparatus, comprising:a plurality of modules each including an interface circuit to transfer digital data; a bus system connecting the modules to each other; a printed wiring board on which the modules are mounted; a termination resistor for matching termination of each lead signal line from the modules; a directional coupler including part of a lead wiring line extending from a first one of the modules and terminating at the termination resistor and part of a lead wiring line extending from each second and subsequent ones of the modules; a via hole of non-through type which establishes connection of the directional coupler between the modules; and two directional couplers disposed at upper and lower positions, respectively in said printed wiring board among directional couplers, used for signal transfer between the modules being connected to each other by said via hole of non-through type to thereby transfer data between the modules.