Equivalent circuit modeling of coupled resonator filters

Paco, Pedro de; Menendez, O.; Corrales, Eden

doi:10.1109/tuffc.894

Cited by 13 publications

(12 citation statements)

References 9 publications

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“…For the purpose of applying synthesis method to CRF design, CRF‐BVD model based on lumped‐element circuit has been derived from the Mason model 18 . However, the reported CRF‐BVD model is obtained under the condition of neglecting electrode layers.…”

Section: Crf Configuration and The Modified Crf‐bvd Modelmentioning

confidence: 99%

“…For the purpose of applying synthesis method to CRF design, CRF-BVD model based on lumped-element circuit has been derived from the Mason model. 18 However, the reported CRF-BVD model is obtained under the condition of neglecting electrode layers. Because electrodes have significant effects on k 2 ef f and frequency shift of BAW resonators, 20,21 F I G U R E 2 Mason model of the coupled resonator filter (CRF) combined with lumped components ignoring them will lead to non-negligible errors in the frequency response of CRF.…”

Section: Modification Of the Crf-bvd Model By Taking Electrodes Into ...mentioning

confidence: 99%

“…Bandwidth broadening ability of CRF has also been verified by the multi‐mode resonance property of it 17 . Based on the equivalent Butterworth–van Dyke (BVD) model of CRF (CRF‐BVD), filter synthesis method can be applied to the design of CRF 18,19 . However, the synthesized CRFs are narrowband because the static capacitors of CRF are not properly matched.…”

Section: Introductionmentioning

confidence: 99%

“…17 Based on the equivalent Butterworth-van Dyke (BVD) model of CRF (CRF-BVD), filter synthesis method can be applied to the design of CRF. 18,19 However, the synthesized CRFs are narrowband because the static capacitors of CRF are not properly matched. The synthesis method also has non-negligible errors when it is applied to wideband CRF design.…”

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Synthesis of wideband bulk acoustic wave coupled resonator filter combined with lumped components

Xie

et al. 2022

Circuit Theory & Apps

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A novel wideband bulk acoustic wave (BAW) coupled resonator filter (CRF) combined with external lumped inductors and capacitors is proposed. The filter synthesis method based on the Butterworth-van Dyke (BVD) model of CRF (CRF-BVD) is also presented. To improve the synthesis accuracy, the CRF-BVD model is modified and the CRF configuration with a single rather than the traditional multiple coupling layer is adopted in this paper. By establishing equivalence relationships between the modified CRF-BVD model and the filter prototype synthesis network, exact CRF dimensions are solved through a set of equations without any further parameters tuning. The proposed method exhibits a maximum 37.4% (FBW) for a Chebyshev filter with 9.4-dB return loss, which overcomes the narrowband limitation of regular BAW filters with FBW below 5%. To demonstrate the synthesis procedure, an n77 band filter with 3.723-GHz center frequency and 24.2% FBW is designed and simulated. Good agreements are obtained among the simulation results of the prototype synthesis network, the modified CRF-BVD model, and the cosimulations of physical model based on the finite element method (FEM) and the CMOS 130-nm technology.bulk acoustic wave, coupled resonator filter, filter synthesis, wideband filter | INTRODUCTIONBulk acoustic wave (BAW) filters have been identified as one of the best filter options for front-end circuits in wireless mobile communication systems owing to their ultrasmall size, low insertion loss (IL), steep skirt selectivity, and high power handling capability. 1,2 However, the bandwidth of BAW filters is limited by the effective electromechanical coupling coefficient k 2 ef f of BAW resonators. 3,4 The k 2 ef f must be at least double the fractional bandwidth (FBW) of a radio band. Therefore, the commercialized aluminum nitride (AlN) based BAW filter with k 2 ef f less than 7% can only reach a fractional bandwidth (FBW) below 3.5%. 5 With mobile communication evolving into the 5G era, some new bands with large FBW such as n79 (12.8% FBW), n78 (14.8% FBW), and n77 (24.2% FBW) have been proposed. Such wide bandwidths are hard to achieve with regular BAW filters. 6,7 To improve the bandwidth of BAW filters, some approaches have been developed. One is adding auxiliary inductors in series/parallel with the shunt/series resonators. 8,9 However, the bandwidth cannot be extended too much due to the limited distance between the transmission zeros at the lower and upper sides of the passband. Unexpected passbands also appear in the stopband range and affect the broadband rejection performance. 10 One method is employing

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Section: Crf Configuration and The Modified Crf‐bvd Modelmentioning

confidence: 99%

Section: Modification Of the Crf-bvd Model By Taking Electrodes Into ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Synthesis of wideband bulk acoustic wave coupled resonator filter combined with lumped components

Xie

et al. 2022

Circuit Theory & Apps

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“…Electrode layer It is convenient to derive whole impedance of the circuit by using ABCD-parameters (Paco et al, 2008) As shown in Eqs. (28)- (32), ABCD-parameters of whole circuit is derived multiplying each circuit element.…”

Section: Substratementioning

confidence: 99%