Multilayer substrate module and wireless portable terminal

Abstract

In the present invention, a plurality of earth lines corresponding to a plurality of interior circuits are arranged in the multi-layer substrate modules of the reference potential for receiving ground-engaging from external earth points, common nodes (Ncmn) for connecting ground connection lines are arranged in the insulating layer of the multi-layered substrate module, which is connected with the earth engaging nodes through the common earth terminal 204 between a plurality of interior circuits, the nodes are preferably arranged in the insulating layer on the lowest layer of the multilayer substrate module. By applying the invention, the internal flow of earth-current between a plurality of interior circuits can be prevented.

Description

[0001] This application is a divisional application of the following applications: [0002] Invention Title: "Multilayer substrate module and wireless portable terminal" [0003] Application date: June 29, 2000 [0004] The application number is: 00812234.2 (PCT / JP00 / 04305) Technical field [0005] The present invention relates to a multilayer substrate module. More specifically, it relates to a multilayer substrate module formed with an electronic circuit that operates in a high-frequency region, and a wireless terminal device equipped with a circuit mounted on the multilayer substrate module. Background technique [0006] In recent years, electronic equipment has been developing towards size and weight, and circuit boards used in electronic equipment have also been developed to be smaller, lighter, thinner, and more complex in a form that matches this trend. In particular, in wireless communication devices that utilize high frequencies, such as mobile phones, based on the excell...

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Problems solved by technology

[0041] That is, if Figure 25 As shown, for example, the ground current Igrd that flows into the ground node 20 from the first mixer 410a flows into the second mixer 410b along the current path indicated by a dotted line due to the influence of the parasitic inductance Lgrd of the main ground wiring 150. , potentially compromising the orthogonality of the 2 mixers

Due to the adverse effects of such inflow current Igrd', such as Figure 26 As shown, there will be an amplitude error ΔA or a phase error Δφ between the baseband signals BBI and BBQ, which will damage the quadrature accuracy of the quadrature mixer.

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