Design and Analysis of On-Chip Tapered Transformers for Silicon Radio-Frequency Integrated Circuits

Cho, Ming-Hsiang; Chen, Kun-Ming; Huang, Guo–Wei; Chiu, Chia-Sung

doi:10.1143/jjap.44.2166

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…To evaluate the inductance of the primary turn of a tapped transformer, we employ the experimental formula [23], [24]: (10) where N p is the number of primary turns, N s is the number of secondary turns, OD is the outer diameter, ID is the inner diameter, W is the track width, and S is the line-to-line spacing.…”

Section: Effect Of Geometrical Parametersmentioning

confidence: 99%

“…This structure simply permits for any ratio of N P : N S , but in return, due to the large relative distance between windings of the two spirals it consequences in a awfully small coupling coefficient, K. Clearly, because of including straight relations between two spirals there is a superior possibility of circulating tall levels of noise between parts of the circuit that use magnetic coupling. On the other hand, due to low surface area between the two inductors, the resulted parasitic capacitance is extremely small which consequences in tall self resonance frequency [10]. The advantages are short port-to-port capacitance and tall L p and L s but have the disadvantages of organism asymmetric and have short coupling coefficient, approximately around 0.3 to 0.7 [11].…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Structure Optimization of Tapped Transformer

Namoune¹,

Hamid²,

Taleb

2017

IJECE

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In this paper, a simplified circuit model of the tapped transformer structure has been presented to extract the Geometric and technology parameters and offer better physical understanding. Moreover, the structure of planar transformer has been optimized by using changing the width and space of the primary coil, so as to enlarge the quality factor Q and high coupling coefficient K. To verify the results obtained by using these models, we have compared them with the results obtained by employing the MATLAB simulator. Very good agreement has been recorded for the effective primary inductance value, whereas the effective primary quality factor value has shown a somewhat larger deviation than the inductance.

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Section: Effect Of Geometrical Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Structure Optimization of Tapped Transformer

Namoune¹,

Hamid²,

Taleb

2017

IJECE

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“…consuming. Some approaches were based on numerical analysis and empirical formulas [1,[13][14] CS=N-Cov=N-w 2 d (12) M-0.47 pN (3) where d is the oxide thickness between the spiral and the Table I. As shown in the figure, the series resistance is approximately constant until the frequency reaches 100 MHz after that the resistance increases with the frequency increases.…”

mentioning

confidence: 99%

Compact Circuit Simulation Model for On-Chip Inductor and Transformer for RF Integrated Circuits

Hasaneen

2007

2007 2nd International Design and Test Workshop

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This paper describes modeling of on-chip inductors using lumped elements [15][16][17]. In this paper, a circuit and transformers for high frequency integrated circuit simulation model for on-chip inductors and transformers has applications. The effects of the substrate losses, substrate been developed. This model can help the designers to predict capacitances, overlap capacitances between the turns of spiral and optimize the device characteristics. It is also useful to and the cross-under layer, and the oxide capacitance between the simulate on-chip inductors and transformers using integrated spiral and the substrate are included in the analysis. Quality factor and scattering matrix forward transmission coefficient are circuits CAD tools such as SPICE. computed based on the proposed model. This model will facilitate This paper is organized as follows. Section II describes onon-chip inductor and transformer design and also useful to chip inductor equivalent circuit and modeling. Modeling of simulate on-chip inductors and transformers using integrated stacked on-chip transformer is presented in Section III. Results circuits CAD tools such as SPICE. and discussions are described in Section IV and it is followed Keywords-on-chip inductor; on-chip transformer; self and by conclusion in Section V. mutual inductances; scattering matrix, qualityfactor. Fig. 1 shows implementation of on-chip spiral inductor. The The demands placed on portable wireless communication inductor is a metal layer grown on a top of Si substrate. The equipments for high performance and integration levels have equivalent lumped model is shown in Fig. 2. The inductance generated much interest in integrated radio frequency (RF) and resistance of a spiral are represented by Ls and Rs inductors and transformers. In earlier days RF passive respectively. Cs is the overlap capacitance between the turns components such as inductor and transformer were of spiral and the cross-under layer. Cox is the oxide implemented as off-chip components. As the increasing of the capacitance between the spiral and the substrate. Csi and Rs, operating frequency, on-chip radio frequency integrated are the parameters modeling substrate losses and capacitive circuits (RFICs) are received a great attention because of the effects respectively. potential of achieving low cost, low supply voltage, low power II. MODELING OF ON-CHIP INDUCTOR I. INTRODUCTIONThe series inductance Ls includes both the self and mutual dissipation, small size, low noise, and high operating inductances and given by frequency [ 1].On-chip inductor is one of the essential elements of Ls = Lsef+ M+-M (1) communication circuit blocks. It is widely used in many where Lseif is the self inductance and for a rectangular applications such as voltage-controlled oscillators, low noise conductor it is a summation of the self-inductances of straight amplifiers, on-chip LC filtering, and mixers [2-6]. On the segments [18] and can be expressed as other hand, on-chip transformer has variety applications on the on-chi...

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Design and Analysis of On-Chip Tapered Transformers for Silicon Radio-Frequency Integrated Circuits

Cited by 2 publications

References 10 publications

Modeling and Structure Optimization of Tapped Transformer

Modeling and Structure Optimization of Tapped Transformer

Compact Circuit Simulation Model for On-Chip Inductor and Transformer for RF Integrated Circuits

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