Analysis and Design of Planar, Spiral-Shaped, Transmission-Line Transformers

Post, John E.

doi:10.1109/tadvp.2006.890208

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…At low frequency, TLTs can be fabricated from bifilar lines wound around ferrite cores, while at UHF or higher frequencies coaxial lines are usually employed. In addition, micro-coaxial [124] and monolithic microwave integrated circuit (MMIC) implementations [125], [126] of the Guanella and Ruthroff transformers have been demonstrated up to Ka band.…”

Section: A4 Cmentioning

confidence: 99%

GaN Microwave DC–DC Converters

Ramos

Ruiz

Garcia

et al. 2015

IEEE Trans. Microwave Theory Techn.

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Section: A4 Cmentioning

confidence: 99%

GaN Microwave DC–DC Converters

Ramos

Ruiz

Garcia

et al. 2015

IEEE Trans. Microwave Theory Techn.

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“…1. However, in the case of the asymmetric-width transformer, the characteristics of the transformer are determined by the physical dimensions of each part, including width, length, and thickness [8], [9]. Thus, only one single-turn line inductor is required, as shown in Fig.…”

Section: High-q Transformer With Asymmetric Widthmentioning

confidence: 99%

“…This effect, as well as skin effect, causes severe ohmic losses [8], [13]. However, an asymmetricwidth transformer eliminates high-frequency loss because the capacitive coupling effect is absorbed into the characteristic impedance of the transformer [8], [9]. • The increased length of the primary metal due to more than one turn makes the inductance larger than required at higher frequencies.…”

Section: High-q Transformer With Asymmetric Widthmentioning

confidence: 99%

Design of a 24-GHz CMOS VCO With an Asymmetric-Width Transformer

Yang

Kim

et al. 2010

IEEE Trans. Circuits Syst. II

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A K-band CMOS voltage-controlled oscillator (VCO) is implemented with a 0.18-µm radio frequency CMOS process. For low supply voltage operation, a transformer-feedback topology using a transformer is proposed. The analysis of the transformer-feedback VCO is presented. This shows that the inductance ratio of the transformer must be optimized, and asymmetric-width transformers allow the easy optimization and the high Q-factor. Based on this analysis, the transformer design consideration of the transformer feedback VCO is presented. The VCO operates at 24.27 GHz with the phase noise of −100.33 dBc/ Hz at 1-MHz offset, and it consumes 7.8 mW from a 0.65-V supply voltage.

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“…Examples have been implemented in monolithic microwave integrated circuits [4], [8], [9], several were implemented with coupled microstrip lines [10], [11], and one recent example for superconducting applications was implemented as a 6.25 to 25 transformer from 2-13 GHz [12].…”

mentioning

confidence: 99%

Broadband Planar 5:1 Impedance Transformer

Ehsan

Hsieh

Moseley

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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This letter presents a broadband Guanella-type planar impedance transformer that transforms 50 to 10 with a 10 dB bandwidth of 1-14 GHz. The transformer is designed on a flexible 50 thick polyimide substrate in microstrip and parallel-plate transmission line topologies, and is inspired by the traditional 4:1 Guanella transformer. Back-to-back transformers were designed and fabricated for characterization in a 50 system. Simulated and measured results are in excellent agreement.

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Analysis and Design of Planar, Spiral-Shaped, Transmission-Line Transformers

Cited by 15 publications

References 9 publications

GaN Microwave DC–DC Converters

GaN Microwave DC–DC Converters

Design of a 24-GHz CMOS VCO With an Asymmetric-Width Transformer

Broadband Planar 5:1 Impedance Transformer

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