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This paper presents the design and electrical performance of transformers with magnetic thin films for on-chip power conversion and isolation. The inductance of the devices is greatly enhanced by the use of a high-permeability magnetic material as a solenoid core, resulting in an inductance density of 108 nH/mm2. The total thickness of the transformer structures is3. By laminating the magnetic core, losses are well controlled leading to a peak quality factor (Q) of 16 at 40 MHz.
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Wu et al. (2016) studied this question.
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