Variable inductance device

An Inductive Device, Variable Technology

Active Publication Date: 2020-01-07
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current design of variable inductors, the quality factor of the overall inductor is often reduced due to the existence of the modulation circuit.

Method used

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  • Variable inductance device
  • Variable inductance device
  • Variable inductance device

Examples

Experimental program
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Effect test

Embodiment Construction

[0048] Please refer to figure 1 . figure 1 It is a schematic diagram of a variable inductance device 1 in an embodiment of the present invention. The variable inductance device 1 includes: a figure-eight inductor 10 , a pair of modulating coils 12 , a first switch 140 and a second switch 142 .

[0049] The figure-eight inductor 10 includes two sub-loops 100 and 102 electrically coupled to each other. Wherein, one end of the sub-loop 100 is electrically coupled to the sub-loop 102, and the other end is electrically coupled to the positive terminal (in figure 1 is represented by the symbol "+"). One end of the sub-loop 102 is electrically coupled to the sub-loop 100, and the other end is electrically coupled to the negative terminal (in figure 1 is represented by the symbol "-").

[0050] In one embodiment, the figure eight inductor 10 further includes a center tap 104 . The center tap 104 is formed on one of the sub-loop 100 and the sub-loop 102 . At figure 1 , the cent...

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PUM

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Abstract

A variable inductance device comprises a splayed inductor, a pair of modulation coils, a first switch and a second switch. The splayed inductor comprises two sub-loops which are electrically coupled with each other. The modulation coils comprise a first modulation coil and a second modulation coil which are respectively and correspondingly arranged above one of the two sub-loops. The first switchand the second switch are respectively arranged on the first modulation coil and the second modulation coil; the first switch and the second switch enable the first modulation coil and the second modulation coil to form an open loop in the on state and enable the first modulation coil and the second modulation coil to form a closed loop in the off state respectively so as to modulate the inductance value of the splayed inductor.

Description

technical field [0001] The present invention relates to an inductance technology, and in particular to a variable inductance device. Background technique [0002] An inductor is a circuit element that generates an electromotive force due to a change in the passing current, thus resisting the change in current. In today's integrated circuits, circuits of multiple frequency bands are usually integrated into the same chip. It is often necessary to use variable inductance between circuits of different frequency bands to solve the problem of magnetic field coupling. However, in the current design of variable inductors, the quality factor of the overall inductor often decreases due to the existence of the modulation circuit. [0003] Therefore, how to design a new variable inductance device to solve the above problems is an urgent problem to be solved in the industry. Contents of the invention [0004] Therefore, an aspect of the present invention is to provide a variable ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F21/12H01F21/00H01F27/28H01F27/40
CPCH01F21/005H01F21/12H01F27/28H01F27/40
Inventor 黄凯易
Owner REALTEK SEMICON CORP
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