Load Characteristics of a Spiral Coil Type Thin Film Microtransformer

K. Yamaguchi, E. Sugawara, O. Nakajima, H. Matsuki, K. Murakami

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


A spiral coil type thin film micro-transformer with the size of 2.4 x 3.1 mm2was fabricated using photolithography techniques for application in mega-hertz region switching regulators. An amorphous magnetic film of a multilayered CoNbZr/Si02 was used as magnetic core. Load characteristics were measured at 10 MHz. A comparatively high efficiency of 67% and an acceptable excitation current of 25 mA were obtained in spite of the small size of the microtransformer.

Original languageEnglish
Pages (from-to)3207-3209
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number6
Publication statusPublished - 1993 Nov


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