Characteristics evaluation of intermediate layer circuit

摘要

The circuit characteristics of an intermediate layer between an uppermost layer and a lowermost layer of a ceramic multilayer substrate with substrates laminated can be evaluated. A method for evaluating the characteristics of the intermediate layer circuit is provided. The intermediate layer circuit is installed on the intermediate layer of the multilayer substrate and has a wiring and a grounding pad, holding grounding potential, formed in the vicinity of the wiring. The method includes steps of: irradiating a region of the upper layer substrate located above the grounding pad of the intermediate layer with laser to scrape to a predetermined thickness; polishing the upper layer substrate scraped to the predetermined thickness with a hard polishing tool to expose the wiring and/or grounding pad; and bringing a probe needle in contact with the exposed wiring and/or grounding pad to evaluate characteristics of the intermediate layer circuit.