A G-Band Standing-Wave Push–Push VCO Using a Transmission-Line Resonator

Koo, Hyunji; Kim, Choul‐Young; Hong, Songcheol

doi:10.1109/tmtt.2015.2398445

Cited by 30 publications

(7 citation statements)

References 20 publications

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“…However, this approach also has a limitation because the Q factor of the respective coupled oscillator should be low to allow a wide tuning range, which leads to small [8]. The distribution of negative gm cells in a standing wave oscillator also has been introduced to enable a wide tuning range [24], but high 2nd harmonic power cannot be generated because the voltage swings across the distributed gm cells are small. Previous works [14], [15] has shown that a Colpitts VCO without a varactor has high efficiency, in which the frequency tuning is obtained by gate bias control.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of 239 GHz CMOS Push-Push Transformer-Based VCO With High Efficiency and Wide Tuning Range

Koo

Kim

Hong

2015

IEEE Trans. Circuits Syst. I

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A push-push transformer-based voltage-controlled oscillator (VCO) is proposed and analyzed to achieve high efficiency and a wide tuning range at sub-terahertz (THz) frequencies.Analyses show that the coupling factor of the transformer to obtain high output power has to be carefully chosen by consideration of gate-to-drain voltage gain as well as matching impedances seen from the drain and to the gate of a VCO transistor at the 2nd harmonic frequency . Analysis also shows that the transformer-based resonator allows a wide tuning range. In addition, it has been shown that the introduction of a parallel inductor to a varactor leads to high and low phase noise. The proposed 239 GHz VCO with a 65 nm CMOS process demonstrates the high efficiency of 1.45%, the of 4.8 dBm, and the wide tuning range of 12.5% with a supply voltage of 1.2 V.Index Terms-High efficiency, J-band, millimeter wave, push-push oscillator, terahertz, transformer, voltage-controlled oscillator (VCO), wide tuning range.

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Section: Introductionmentioning

confidence: 99%

Design and Analysis of 239 GHz CMOS Push-Push Transformer-Based VCO With High Efficiency and Wide Tuning Range

Koo

Kim

Hong

2015

IEEE Trans. Circuits Syst. I

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“…The main drawback of these techniques is that the output power becomes low at higher harmonics and they often need more DC power to compensate it. A push-push architecture [21,22] is also used to have more output power but it also leads to large area occupation due to the multiple VCOs. Though various other oscillation techniques such as frequency up-conversion [23] or quadrature coupling [24,25] have been proposed to realize millimeter-wave output, to achieve low phase noise and low power consumption with a small area at high frequency is still challenging.…”

Section: Introductionmentioning

confidence: 99%

A 140 GHz area-and-power-efficient VCO using frequency doubler in 65 nm CMOS

Otsuki

Khanh

Iizuka

2019

IEICE Electron. Express

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This paper presents a compact, low-phase-noise and low-power D-band VCO with the tuning range from 140.1 to 143.5 GHz. To improve the area and power efficiency, we avoid using signal amplification and matching circuits in the VCO, where a 70 GHz LC oscillator is directly coupled to a frequency doubler. The layout of the transistors is optimized so that the signal loss and reflection are minimized. The proposed VCO fabricated in a 65 nm CMOS technology occupies the core area of 0.05 mm 2. It achieves the output power of −8 dBm and the phase noise of −108.2 dBc/Hz at 10 MHz offset with the power consumption of 24 mW from 1 V supply, which leads to the figure-of-merit (FoM) of −177.4 dBc/Hz.

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“…A voltage-controlled oscillator (VCO) is one of the essential building blocks of the RF systems used in wireless communication applications [1][2][3][4][5]. Given that the VCO generates a carrier signal in RF systems, the performance of the VCO affects the overall performance of the RF system.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, extensive research work has been carried out in the design of broadband microwave components and systems. UWB power splitters are being studied and researched extensively [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers had reported various circuit structures in literature [1][2][3][4][5][6][7][8][9] to realize power splitters with wide and broad operating bandwidth. Broadband power splitters have been conventionally realized using Lange couplers and multistage Wilkinson splitters [1][2][3]. Although Lange coupler is broadband in nature, the critical issue is the bonding between alternate arms of couplers which limits the frequency of operation.…”

Section: Introductionmentioning

confidence: 99%

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A CMOS voltage-controlled oscillator using a cascode structure

Shin

Lee

et al. 2016

Microw. Opt. Technol. Lett.

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In this study, a cascode CMOS voltage-controlled oscillator (VCO) to reduce the power consumption related to the RF system level and to increase the output power was proposed. The proposed VCO core consists of a cascode structure to increase the supply voltage of the VCO. To mitigate the reliability problems associated with gatesource and gate-drain breakdowns, the gate nodes of common-source transistors were connected to the source nodes of common-gate transistors. To verify the functionality of the proposed VCO, a 2.4-GHz CMOS VCO using the 110-nm RF CMOS process was designed. From the measured results, a relatively high output power with a 2.2 V supply voltage was obtained.

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A G-Band Standing-Wave Push–Push VCO Using a Transmission-Line Resonator

Cited by 30 publications

References 20 publications

Design and Analysis of 239 GHz CMOS Push-Push Transformer-Based VCO With High Efficiency and Wide Tuning Range

Design and Analysis of 239 GHz CMOS Push-Push Transformer-Based VCO With High Efficiency and Wide Tuning Range

A 140 GHz area-and-power-efficient VCO using frequency doubler in 65 nm CMOS

A CMOS voltage-controlled oscillator using a cascode structure

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