The Experts below are selected from a list of 9000 Experts worldwide ranked by ideXlab platform
Andrea Bevilacqua - One of the best experts on this subject based on the ideXlab platform.
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Analysis and Design of a 17-GHz All- npn Push-Pull Class-C VCO
IEEE Journal of Solid-State Circuits, 2020Co-Authors: Simone Veni, Pietro Andreani, Michele Caruso, Marc Tiebout, Andrea BevilacquaAbstract:A push-pull oscillator topology that uses only one type of active device is proposed in this article. A Magnetic Transformer is leveraged to set positive feedback around a common-collector differential npn transistor pair, implementing the push-pull operation. This results in half the bias current for a given amplitude of oscillation, compared to more standard oscillator topologies. A thorough phase noise analysis of the circuit is carried out, emphasizing the crucial role of the Magnetic Transformer in the circuit operation and noise optimization. Proof-of-concept prototypes implemented in a 130-nm SiGe BiCMOS technology operate at 17 GHz and show a phase noise as low as −116 dBc/Hz at 1-MHz offset, while drawing 13.7 mA from the 3.3-V supply. The tuning range is 15%. While the circuit is demonstrated in SiGe BiCMOS technology, it lends itself equally well to implementations in other technologies where only one fast device is available, such as SiGe HBT, InP HBT, and GaN HEMT.
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A 17 GHz All-npn Push-Pull Class-C VCO
2019 IEEE BiCMOS and Compound semiconductor Integrated Circuits and Technology Symposium (BCICTS), 2019Co-Authors: Simone Veni, Michele Caruso, Marc Tiebout, Andrea BevilacquaAbstract:A SiGe BiCMOS push-pull class-C VCO operating at 17 GHz and making use of only npn transistors is presented. A Magnetic Transformer is used to set positive feedback around a common-collector differential pair and implement the push-pull operation. This allows to halve the bias current for a given amplitude of oscillation, while using just one type of active devices. The oscillator features a phase noise as low as -116 dBc/Hz at 1 MHz offset, while drawing 13.7 mA from the 3.3 V supply. The tuning range is 15%.
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Second-Order Equivalent Circuits for the Design of Doubly-Tuned Transformer Matching Networks
IEEE Transactions on Circuits and Systems I: Regular Papers, 2018Co-Authors: Andrea Mazzanti, Andrea BevilacquaAbstract:The doubly-tuned Magnetic Transformer, comprising coupled inductors shunted by capacitors, is today widely in use as interstage network and for impedance matching in silicon millimeter waves amplifiers. It provides several advantages, compared with simple LC resonators, but the design is made complex by the high order of the network, featuring multiple resonances, and by the large number of components to be selected. In this paper, a novel approach for the analysis and design of such a network is proposed. It is shown that the response can be very well approximated, in the neighborhood of each resonance frequency, by a second-order parallel or series RLC equivalent circuit. This yields simple equations for the impedance, the bandwidth, and the power loss, giving intuition into the network behavior, and greatly simplifying the design. Based on the results of the analysis, guidelines for the network optimization are proposed, targeting minimum power loss and a flat broadband response. Design examples of practical interest are presented: the component values estimated by hand calculation are in very good agreement with those provided by a numerical circuit optimizer.
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Design of Low-Noise $K$ -Band SiGe Bipolar VCOs: Theory and Implementation
IEEE Transactions on Circuits and Systems I: Regular Papers, 2015Co-Authors: Fabio Padovan, Marc Tiebout, Andrea Bevilacqua, Koen Mertens, Andrea NevianiAbstract:A study of $K$ -band SiGe bipolar VCOs is reported in this paper. The design challenges related to the operation in the $K$ -band and the use of a pure bipolar technology are discussed with particular emphasis to achieving low phase noise while using varactor diodes. Two different VCOs have been designed and fabricated. In the designs, the varactor is coupled to the active element by means of a Magnetic Transformer to avoid the use of tuning voltages exceeding the supply voltage. All the VCOs are operated in class-C. One of the designs features dynamic biasing to ensure robust start-up conditions. The VCOs feature a phase noise as low as $-$ 137 dBc/Hz at 10 MHz offset from the carrier. The VCOs show a state-of-the-art $FOM$ of $-$ 189 dBc/Hz, and an excellent $FOM_{T}$ of $-$ 193 dB/Hz.
Hwi-beom Shin - One of the best experts on this subject based on the ideXlab platform.
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Integrated Magnetic Transformer for ZVS Phase Shift Full Bridge Converter
The Transactions of the Korean Institute of Power Electronics, 2010Co-Authors: Xin-lan Li, Yong-hwan Shin, Jae-sun Won, Jong-sun Kim, Hwi-beom ShinAbstract:An integrated Magnetic (IM) Transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a proposed IM Transformer, the Transformer is located on the center leg of E-core and the output inductor is wound on two outer legs with air gap. The proposed IM Transformer is analyzed by using the Magnetic capacitor model. For reducing the core size, EE core is redesigned. The proposed IM Transformer is experimentally verified on a 1.2 kW prototype converter. The converter efficiency with the proposed IM Transformer is about 93 % at full load and its volume size can be reduced. It can be expected that the power density can be largely increased with the proposed IM Transformer.
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Design of Integrated Magnetic Transformer for ZVS Phase Shift Full Bridge Converter
2008Co-Authors: Xin-lan Li, Jae-sun Won, Jong-sun Kim, Eun-sung Jang, Yong-whan Shin, Dong-seong Oh, Hwi-beom ShinAbstract:This integrated Magnetic (IM) Transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a new IM Transformer, the Transformer is located on the center leg of E-core and the output inductor is wound on two outer legs. The proposed circuit is analyzed electrically and Magnetically. An E-core is redesigned and implemented. The proposed IM Transformer is experimentally compared with the conventional one through a 1.2㎾ prototype converter.
Xin-lan Li - One of the best experts on this subject based on the ideXlab platform.
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Integrated Magnetic Transformer for ZVS Phase Shift Full Bridge Converter
The Transactions of the Korean Institute of Power Electronics, 2010Co-Authors: Xin-lan Li, Yong-hwan Shin, Jae-sun Won, Jong-sun Kim, Hwi-beom ShinAbstract:An integrated Magnetic (IM) Transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a proposed IM Transformer, the Transformer is located on the center leg of E-core and the output inductor is wound on two outer legs with air gap. The proposed IM Transformer is analyzed by using the Magnetic capacitor model. For reducing the core size, EE core is redesigned. The proposed IM Transformer is experimentally verified on a 1.2 kW prototype converter. The converter efficiency with the proposed IM Transformer is about 93 % at full load and its volume size can be reduced. It can be expected that the power density can be largely increased with the proposed IM Transformer.
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Design of Integrated Magnetic Transformer for ZVS Phase Shift Full Bridge Converter
2008Co-Authors: Xin-lan Li, Jae-sun Won, Jong-sun Kim, Eun-sung Jang, Yong-whan Shin, Dong-seong Oh, Hwi-beom ShinAbstract:This integrated Magnetic (IM) Transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a new IM Transformer, the Transformer is located on the center leg of E-core and the output inductor is wound on two outer legs. The proposed circuit is analyzed electrically and Magnetically. An E-core is redesigned and implemented. The proposed IM Transformer is experimentally compared with the conventional one through a 1.2㎾ prototype converter.
Jong-sun Kim - One of the best experts on this subject based on the ideXlab platform.
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Integrated Magnetic Transformer for ZVS Phase Shift Full Bridge Converter
The Transactions of the Korean Institute of Power Electronics, 2010Co-Authors: Xin-lan Li, Yong-hwan Shin, Jae-sun Won, Jong-sun Kim, Hwi-beom ShinAbstract:An integrated Magnetic (IM) Transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a proposed IM Transformer, the Transformer is located on the center leg of E-core and the output inductor is wound on two outer legs with air gap. The proposed IM Transformer is analyzed by using the Magnetic capacitor model. For reducing the core size, EE core is redesigned. The proposed IM Transformer is experimentally verified on a 1.2 kW prototype converter. The converter efficiency with the proposed IM Transformer is about 93 % at full load and its volume size can be reduced. It can be expected that the power density can be largely increased with the proposed IM Transformer.
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Design of Integrated Magnetic Transformer for ZVS Phase Shift Full Bridge Converter
2008Co-Authors: Xin-lan Li, Jae-sun Won, Jong-sun Kim, Eun-sung Jang, Yong-whan Shin, Dong-seong Oh, Hwi-beom ShinAbstract:This integrated Magnetic (IM) Transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a new IM Transformer, the Transformer is located on the center leg of E-core and the output inductor is wound on two outer legs. The proposed circuit is analyzed electrically and Magnetically. An E-core is redesigned and implemented. The proposed IM Transformer is experimentally compared with the conventional one through a 1.2㎾ prototype converter.
Jae-sun Won - One of the best experts on this subject based on the ideXlab platform.
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Integrated Magnetic Transformer for ZVS Phase Shift Full Bridge Converter
The Transactions of the Korean Institute of Power Electronics, 2010Co-Authors: Xin-lan Li, Yong-hwan Shin, Jae-sun Won, Jong-sun Kim, Hwi-beom ShinAbstract:An integrated Magnetic (IM) Transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a proposed IM Transformer, the Transformer is located on the center leg of E-core and the output inductor is wound on two outer legs with air gap. The proposed IM Transformer is analyzed by using the Magnetic capacitor model. For reducing the core size, EE core is redesigned. The proposed IM Transformer is experimentally verified on a 1.2 kW prototype converter. The converter efficiency with the proposed IM Transformer is about 93 % at full load and its volume size can be reduced. It can be expected that the power density can be largely increased with the proposed IM Transformer.
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Design of Integrated Magnetic Transformer for ZVS Phase Shift Full Bridge Converter
2008Co-Authors: Xin-lan Li, Jae-sun Won, Jong-sun Kim, Eun-sung Jang, Yong-whan Shin, Dong-seong Oh, Hwi-beom ShinAbstract:This integrated Magnetic (IM) Transformer is proposed for a phase shifted full bridge (PSFB) converter with zero voltage switching (ZVS). In a new IM Transformer, the Transformer is located on the center leg of E-core and the output inductor is wound on two outer legs. The proposed circuit is analyzed electrically and Magnetically. An E-core is redesigned and implemented. The proposed IM Transformer is experimentally compared with the conventional one through a 1.2㎾ prototype converter.