variable inductance

Abstract

A variable inductor includes an inductance element and a first inductance adjustment circuit. The first inductance adjustment circuit includes a first open loop structure and a first switching element. The first switching element is coupled to the first open loop structure. When the first switching element is in a conductive state, the first open loop structure and the first switching element can form a first closed loop to generate a first magnetic flux to change a magnetic flux when the inductor element operates. .

Description

technical field [0001] The invention relates to a variable inductor, in particular to a variable inductor using electromagnetic eddy current effect (Eddy current effect) to adjust the inductance value. Background technique [0002] In the general semiconductor manufacturing process, the manufacture of inductors often uses a conductor with a spiral structure on a plane or stacked to generate a required inductance value. However, generally known semiconductor variable inductors often add structural corrections to the spiral inductor to achieve the purpose of adjusting the inductance value. For example, please also refer to the figure 1 and figure 2 , figure 1 is a schematic circuit diagram of a known variable inductance 100, and figure 2 for figure 1 The schematic diagram of the implementation structure of the variable inductor 100 is shown, wherein the first circuit 110 and the second circuit 120 are two circuits operating at different frequencies (for example, two cir...

AI Technical Summary

Problems solved by technology

However, the switching element SWT must be added to the main body of the inductor, and the effect of its parasitic capacitance or resistance will affect the inductance quality of the variable inductor 300

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