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Symmetrical inductor

An inductor and symmetrical technology, applied in the field of symmetrical inductors, can solve the problems of increased conductor resistance and reduced quality factor

Inactive Publication Date: 2012-03-14
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This in turn leads to an increase in the conductor resistance
For inductors, this increased resistance results in a lower quality factor
For example, for figure-of-eight inductors, it is estimated that skin effect can cause a 25-30% reduction in quality factor

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0029] Embodiments of the present invention are described below with reference to the accompanying drawings.

[0030] image 3 A first embodiment of the invention is shown. In this embodiment, a symmetrical figure-of-eight inductor 2 with a single turn 80 is provided. Therefore, the layout of the inductor 2 in this embodiment can be compared with figure 1 The layout of known conductors is shown for comparison. The inductor 2 includes a pair of terminals 16, 18 to which an inductor turn 80 is terminated at both ends. with the above reference figure 1 While the described known inductor is the same, the inductor 2 in this embodiment includes an overlap point 12 where the conductor turn 80 crosses itself so that the first loop portion 4 of the conductor 2 is connected to the second loop portion. 6 overlapping. These two loop parts together form the “8” shape of the inductor 2 .

[0031] As described herein, according to the present invention there is provided an inductor wh...

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PUM

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Abstract

A symmetrical inductor having at least one inductor turn. Each inductor turn has a plurality of separate conductive paths having substantially equal inductance. The inductor also comprises a plurality of crossing points. At each crossing point, some of the conductive paths within a given inductor turn cross over each other to change the order in which they appear within the inductor turn.

Description

technical field [0001] The present invention relates to symmetrical inductors. Background technique [0002] The use of inductors to implement voltage controlled oscillators in integrated circuits (ICs) including transceivers is known. The inductance required for such an application is typically a few nH, although the inductor design should be able to suit the particular application. It is desirable that the inductors used in these applications provide the highest possible quality factor. It is also desirable that the inductors used should generate a low net magnetic field to minimize magnetic coupling with adjacent components in the IC, including other inductors. Examples of inductors where it is desired to generate a lower net magnetic field are disclosed in WO1998005048, WO2004012213, WO2005096328 and WO2006105184. [0003] figure 1 and 2 The figure eight shape of the inductor 2 is shown in order to minimize the net magnetic field generated. figure 1 The inductor 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F17/00H01F37/00H01F27/28H01L27/00H10N97/00
CPCH01F17/0013H01F2017/0073H01L23/5227H01L28/10H01L2924/0002H01L2924/00
Inventor 亚历克·L·纳扎莱恩丹尼尔·斯蒂芬森卢卡斯·F·蒂梅杰
Owner NXP BV