Modeling high-Q square spiral with variable segment width and spacing

Kobe, Olebogeng Bone; Chuma, Joseph; Jamisola, Rodrigo S.; Chose, Matthews

doi:10.1109/radio.2016.7772019

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Equation ( 5) indicates that, while the ohmic resistance is inversely proportional to W n , the resistance due to the eddy current (the second term of Equation ( 5)) is proportional to W 2 n . A similar observation can be found in [14][15][16][17]. To find the proper line width that can minimize the metal resistance, the differential of R t,n with respect to W n in Equation ( 5) is set to zero, which leads to…”

Section: Design Methodsmentioning

confidence: 78%

“…Due to the induced eddy current, the net current distribution on the metal strip concentrates on the inner edge of the strip and, thus, increases the metal resistance. To mitigate the influence of the eddy current, inductor designs with variable line widths and/or line spacing layouts have been presented [14][15][16][17][18][19][20][21][22][23][24][25]. Figure 1 shows the layout of a spiral inductor with a variable line width design.…”

Section: Introductionmentioning

confidence: 99%

“…Refs. [16][17][18][19][20]22,24] analyzed numerous spirals with different geometrical parameters and performed data comparison to obtain the design results. Refs.…”

Section: Introductionmentioning

confidence: 99%

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Analytic Design of on-Chip Spiral Inductor with Variable Line Width

Chen¹,

Hsu²

2022

Electronics

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On-chip spiral inductors with variable line width layouts are known for their high quality factor (Q-factor). In this paper, we present an analytical approach to facilitate the design of such inductors. Based on an analysis of ohmic and eddy-current losses, we first derive an analytical formula for the metal resistance calculation of a spiral inductor. By minimizing the metal resistance, a simple design equation for finding the proper line width of each coil is then presented. Several 0.18 μm CMOS spiral inductors are investigated, via electromagnetic simulations and experimental studies, to test the proposed resistance calculation, as well as the variable line width design method. It is found that the developed resistance calculation can effectively model the metal-line resistance of a spiral inductor. Moreover, the inductor with a variable line width obtained using the proposed method can significantly improve the Q-factor with little compromise to inductance, which validates the capacity of the developed variable line width design technique. Since the proposed approach can be carried out using analytical calculations, it may be a more efficient design method than those previously reported in the literature.

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Section: Design Methodsmentioning

confidence: 78%