Low-phase-noise LC-VCO using high-Q 8-shaped inductor

Fahs, Bassem; Gamand, P.; Berland, Corinne

doi:10.1049/el.2010.2323

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…Devices description and layouts state of the art 8-shaped inductors are made of 2 consecutive twisted loops with a cross link at the centre of the structure, leading to equal magnetic distribution on each loop but with opposite polarities. a) From [2] b) From [4] c) From [6] Fig. 1 a) presents a higher deployed length in a smaller space compared to 0-shaped one.…”

Section: -Shaped Inductormentioning

confidence: 97%

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Innovative 8-shaped inductors integrated in an advanced BiCMOS technology

Durand

Gianesello

Gloria

2011

2011 IEEE 11th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems

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As integrated inductors are a key component for RF circuits, these devices are mainly highlighted because of an imposing size and disturbing radiations. This article focuses on two innovative 8-shaped inductors presenting size reduction and low radiation capability. 8-shaped devices are compared to octagonal inductors by the way of measurements and simulations. 8-shaped inductors, even if presenting slightly lower electrical performances (lower size but lower quality factor), show interesting coupling reduction, with improvements from 7 to 20 dB depending of inductor design and orientation. Future works will consist of optimizing 2/3-turn 8-shaped layouts and test designs in circuit applications.Index Terms -8-shaped inductor, 2x8-shaped inductor, BiCMOS technology, electro-magnetic coupling, inductive cross talk, integrated passives.

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Section: -Shaped Inductormentioning

confidence: 97%

“…Fig. 1 b) and c) present two 8-shaped inductor layouts that have been tested in [4] and [6] so as to demonstrate the component interest in terms of parasitic coupling reduction.…”

Section: -Shaped Inductormentioning

confidence: 99%

Innovative 8-shaped inductors integrated in an advanced BiCMOS technology

Durand

Gianesello

Gloria

2011

2011 IEEE 11th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems

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“…In general, the phase noise is determined by the quality factor of the tank and the power level of the output signal. Even though numerous VCO topologies aiming at reducing phase noise have been reported in the past decade [1]- [10], it is still difficult to achieve low phase noise and maintain low dc power consumption in the VCO design. The crosscoupled VCO with drain-to-source transformer-based feedback can achieve large voltage swing and low phase noise under low supply voltage [4].…”

Section: Introductionmentioning

confidence: 99%

Design of a Ku-band Low-Phase-Noise VCO Using the Dual $LC$ Tanks

Zou

Yeo

et al. 2012

IEEE Trans. Circuits Syst. II

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A Ku-band voltage-controlled oscillator (VCO) using dual LC tanks, together with feedback, is proposed and designed by using a 0.18-µm Bipolar compatible Complementary Metal Oxide Semiconductor (BiCMOS) process. A triple-coil transformer is employed to provide strong coupling between the two LC tanks and simultaneously introduce a transformer-based feedback. The parameters of the transformer are optimized to provide the required inductance ratios and reduce unwanted parasitic. The phase noise improvement for the proposed VCO is analyzed theoretically and verified by circuit and full-wave electromagnetic simulators. A benefit from the strong coupling between the two LC tanks, the proposed VCO achieves a low phase noise of −117.4 dBc/Hz at 1-MHz offset from an operation frequency of 12.64 GHz with a 4.3-mW power consumption of the VCO core.Index Terms-Dual LC tanks, low phase noise, low power, transformer-based feedback, voltage-controlled oscillator (VCO).

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“…In [3], a tunable negative capacitance (TNC) circuit technique is proposed to cancel the fixed capacitance of the LC tank and extend the tuning range. In lowfrequency applications, a low phase noise is usually obtained by improving the Q-factor of the inductors [4][5][6]. Nevertheless, with the increase of the operating frequency, the Q-factor of the varactor decreases rapidly and becomes lower than that of the inductor at mm-wave frequencies.…”

mentioning

confidence: 99%

A-189 dBc/Hz FoMT Wide Tuning Range VCO Using Q-Factor Enhancement Technique

Liu

Wang

et al. 2015

J Infrared Milli Terahz Waves

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A 28-GHz voltage-controlled oscillator (VCO) with a wide tuning range and a low phase noise is presented in this paper. A PMOS-only cross-coupled pair with a lower flicker noise is exploited to provide the negative resistance. The mechanisms for enhancing the Qfactor of the LC tank at millimeter-wave (mm-wave) frequencies are analyzed and applied to optimize the proposed VCO design to obtain a low phase noise. To guarantee accurate oscillating frequencies, distributed interconnections are carefully modeled by EM simulations. Fabricated in a standard 90-nm CMOS process, the proposed VCO achieves a wide tuning range of 20.1 %, from 25 to 30.66 GHz and a low phase noise of −105.47 dBc/Hz at 1-MHz offset. The current of the core circuit is 10.5 mA under a single 1.2-V supply. The core area of the chip is 0.38 mm×0.24 mm.

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Low-phase-noise LC-VCO using high-Q 8-shaped inductor

Cited by 9 publications

References 2 publications

Innovative 8-shaped inductors integrated in an advanced BiCMOS technology

Innovative 8-shaped inductors integrated in an advanced BiCMOS technology

Design of a Ku-band Low-Phase-Noise VCO Using the Dual $LC$ Tanks

A-189 dBc/Hz FoMT Wide Tuning Range VCO Using Q-Factor Enhancement Technique

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