An inductive component for use in an integrated circuit, a transformer and an inductor formed as part of an integrated circuit

Abstract

Inductive components, such as transformers, can be improved by the inclusion of a magnetic core. However the benefit of having a core is lost if the core enters magnetic saturation. One way to avoid saturation is to provide a bigger core, but this is costly in the context of integrated electronic circuits. The inventor realized that the flux magnetic flux density varies with position in a magnetic core within an integrated circuit, causing parts of the magnetic core to saturate earlier than other parts. This reduces the ultimate performance of the magnetic core. This disclosure provides structures that delay the onset of early saturation, enabling a transformer to handle more power.

Description

technical field [0001] The present invention relates to an improved inductor or an improved transformer manufactured using microelectronic technology, and an integrated circuit comprising such an inductive element. Background technique [0002] Magnetic components such as inductors and transformers are known to have many uses. For example, inductors can be used to make filters and resonant circuits, or they can be used in switching power converters to step up or step down an input voltage for producing different output voltages. Transformers can be used to transfer power or signals from one circuit to another while providing a high level of galvanic isolation. [0003] Inductors and transformers can be fabricated in an integrated circuit environment. For example, it is known that approximately spaced-apart conductors, usually forming a helix or helix, may be formed on or within a semiconductor substrate to form a coil as part of an inductor or transformer. Spiral inductor...

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Problems solved by technology

However, such an arrangement is nonlinear in its performance

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