On-chip transformer

An on-chip transformer and main coil technology, applied in transformers, fixed transformers, electric solid devices, etc., can solve the problems of high loss and low coupling coefficient of on-chip transformers, and achieve the effect of reducing loss, uniform induced current and improving performance.

Active Publication Date: 2014-10-15
WUHAN SYNTEK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above defects or improvement needs of the prior art, the present invention provides an on-chip transformer, which solves the coupling problem of the existing on-chip transformer by splitting the main coil and the secondary coil of the on-chip transformer into multiple parallel primary and secondary coils. The technical problem of low coefficient and high loss, especially suitable for radio frequency integrated circuits

Method used

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Examples

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Effect test

Embodiment 1

[0046] Such as Figure 2a The shown single-layer on-chip transformer 200, 200 is composed of a primary coil 200a, a secondary coil 200b, a primary coil connector 200c, and a secondary coil connector 200d, wherein the primary coil 200a is composed of two equal-width primary and secondary metal coils 200e and 200f connected in parallel, and the secondary coil 200b It consists of two equal-width secondary metal coils 200g and 200h connected in parallel. The basic dimensions of the single-layer on-chip transformer 200 are as follows: the number of primary (secondary) coils N=1, the ratio of the number of primary and secondary coils is 1:1, the width W of the primary coil and the secondary coil is both 20 μm, the width s of the annular dividing groove is 1 μm, The number of sub-coils n is 2, and the width of the sub-coils is w 1 =w 2 = 9.5 μm. Similar to the on-chip transformer 100, in order to avoid the short circuit of the primary and secondary coils, it is necessary to use th...

Embodiment 2

[0048] Such as Figure 3a The illustrated single-layer on-chip transformer 300, 300 consists of a primary winding 300a, a secondary winding 300b, a primary winding connection 300c, and a secondary winding connection 300d. The basic size of the on-chip transformer 300 is similar to that of Embodiment 1, the difference is that the number of sub-coils is 3, and the width of the sub-coils is w 1 =w 2 =w 3 = 6 μm. Comparison of the simulation results of the on-chip transformer 300 and the same structure of the on-chip transformer 100 designed in the prior art Figure 3b As shown, it can be seen that the coupling coefficient of the on-chip transformer 300 is higher than that of the on-chip transformer 100 within the frequency range of 0.8GHz˜10GHz.

Embodiment 3

[0050] Such as Figure 4a The illustrated single-layer on-chip transformer 400, 400 consists of a primary winding 400a, a secondary winding 400b, a primary winding connection 400c, and a secondary winding connection 400d. The basic size of the on-chip transformer 400 is similar to Embodiment 1, the difference is that the number of primary (secondary) sub-coils is 4, and the width of the primary (secondary) sub-coils is w 1 =w 2 =w 3 =w 4 = 4.25 μm. Comparison of the simulation results of the single-layer on-chip transformer 400 and the on-chip transformer 100 with the same structure designed in the prior art Figure 4b As shown, it can be seen that the coupling coefficient of the single-layer on-chip transformer 400 is higher than that of the on-chip transformer 100 within the frequency range of 1.5 GHz to 10 GHz.

[0051] The above three embodiments are mainly designed from different numbers N of primary (secondary) sub-coils.

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Abstract

The invention discloses an on-chip transformer which comprises a main coil, a secondary coil, a main coil connector and a secondary coil connector, wherein the main coil is divided into n main sub-coils connected in parallel by (n-1) mutually spaced annular division grooves; the secondary coil is divided into n secondary sub-coils connected in parallel by (n-1) mutually spaced annular division grooves; the width of the ith main sub-coil and the width of the ith secondary sub-coil are same and are wi; and the width of the main coil and the width of the secondary coil are same and are W. The main coil and the secondary coil of the on-chip transformer are divided into the main sub-coils connected in parallel and the secondary sub-coils connected in parallel by the mutually spaced annular division grooves, so that surface areas of the main coil and the secondary coil are reduced, a proximity effect of a surrounding conductor and electromagnetic interference of an environment are reduced, and the performance of the on-chip transformer is improved effectively.

Description

technical field [0001] The present invention relates to the field of integrated circuits, and more particularly relates to a transformer structure on an integrated circuit chip. Background technique [0002] On-chip transformers are widely used in the design of radio frequency integrated circuits (RFICs), such as power amplifiers (PAs), low-noise amplifiers (LNAs), mixers (Mixers), voltage-controlled oscillators (VCOs), etc. On-chip transformers are generally used to realize the transition between single-ended signals and differential signals, and can also be used to realize functions such as broadband matching, signal feedback, and power synthesis, so the performance of the on-chip transformer directly determines the performance of the designed circuit. [0003] Generally speaking, the coupling coefficient k between the primary coil and the secondary coil is one of the main properties of the on-chip transformer. The larger the k value, the tighter the coupling between the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/02H01F30/06
Inventor 任志雄张科峰刘览琦任达明
Owner WUHAN SYNTEK CO LTD
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