Multifrequency Small-Signal Model for Buck and Multiphase Buck Converters

Qiu, Yang; Xu, Ming; Yao, Kaiwei; Sun, Jiajia; Lee, F.C.

doi:10.1109/tpel.2006.880354

Cited by 115 publications

(51 citation statements)

References 12 publications

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“…In order to have a ripple comparison between different buck converters, the ripples of the DF buck in (11) are rewritten based on the frequency ratio of high and low frequency cells, M, (f H = M f L ), as follows:…”

Section: Ripple Comparisonmentioning

confidence: 99%

Double‐frequency buck converter as a candidate topology for integrated envelope elimination and restoration applications in power supply of RFPAs

Saberkari

Shirmohammadli

Sarmiento

et al. 2015

Circuit Theory & Apps

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Summary This paper proposes the use of double‐frequency (DF) buck converter architecture consisting of a merged structure of high and low frequency buck cells as a candidate topology for envelope elimination and restoration (EER) applications and integrated power supply of RF power amplifiers (RFPA) to obtain favorable tradeoffs in terms of efficiency, switching ripple, bandwidth, and tracking capability. It is shown that having two degrees of freedom in designing the DF buck helps to achieve high efficiency, low output ripples, and tracking capability with low ripples, simultaneously. A comparison analysis is done with regards to the mentioned performance indexes with the standard and three‐level buck converters; in addition, the results are validated in HSPICE in BSIM3V3 0.35‐µm CMOS process. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Ripple Comparisonmentioning

confidence: 99%

Double‐frequency buck converter as a candidate topology for integrated envelope elimination and restoration applications in power supply of RFPAs

Saberkari

Shirmohammadli

Sarmiento

et al. 2015

Circuit Theory & Apps

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“…There has been research about extending the validity of the small-signal model up to the switching frequency; models suggested include the sample-data model and the harmonic balance model [9]- [12]. By taking into consideration of the sideband components' effect through the feedback control loops, the concept of the multifrequency model was proposed in [12].…”

Section: Analysis With Multifrequency Modelmentioning

confidence: 99%

“…By taking into consideration of the sideband components' effect through the feedback control loops, the concept of the multifrequency model was proposed in [12]. In a buck converter with constant input voltage, the only nonlinear in its small-signal model is the PWM.…”

Section: Analysis With Multifrequency Modelmentioning

confidence: 99%

Modeling and Analysis for Beat-Frequency Current Sharing Issue in Multiphase Voltage Regulators

Sun

Lee

et al. 2007

2007 IEEE Power Electronics Specialists Conference

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Under high-frequency repetitive load transients, multiphase voltage regulators (VRs) suffer from beat-frequency oscillations of the phase currents. To investigate this issue, this paper develops a methodology based on the multifrequency model with describing functions. The influences from the interleaving operation are identified. After that, the analysis is extended to studying of the higher-order beat-frequency issue. Then, a solution by applying coupled inductors is proposed. Experimental and simulation results are presented as verification. *

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“…This discussion will try to help in the design of high frequency PWM modulators. It is important to note that the aim of this paper is not to develop a small signal model of the PWM modulator as in [11], [12].…”

Section: Introductionmentioning

confidence: 99%

On the estimation of the spectrum of discrete pulsewidth modulated signals

Miaja

Rodríguez

Sebastián

et al. 2014

2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL)

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The estimation of the spectrum of a pulse train modulated by a reference waveform in pulsewidth modulation (PWM) can be simplified if certain assumptions, based in the fact that the pulse train is generated in a discrete way, are taken into account. Sampling and quantization are applied both to the reference signal and to the PWM ramp leading to a simple method to calculate the Discrete Fourier Transform (DFT) of a PWM signal. This DFT can be used to estimate the Power Spectral Density (PSD) of the PWM signal. The estimation of the spectrum is a keystone of the design of the filter of a Buck converter used as Envelope Modulator in Envelope Tracking applications.

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Multifrequency Small-Signal Model for Buck and Multiphase Buck Converters

Cited by 115 publications

References 12 publications

Double‐frequency buck converter as a candidate topology for integrated envelope elimination and restoration applications in power supply of RFPAs

Double‐frequency buck converter as a candidate topology for integrated envelope elimination and restoration applications in power supply of RFPAs

Modeling and Analysis for Beat-Frequency Current Sharing Issue in Multiphase Voltage Regulators

On the estimation of the spectrum of discrete pulsewidth modulated signals

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