A 4.39–5.26 GHz LC-Tank CMOS Voltage-Controlled Oscillator With Small VCO-Gain Variation

Moon, Young‐Jin; Roh, Yong-Seong; Jeong, Chan-Young; Yoo, Changsik

doi:10.1109/lmwc.2009.2024846

Cited by 101 publications

(16 citation statements)

References 8 publications

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“…Although LC-VCOs achieve a much better phase noise performance than their ring-VCO counterparts, care needs to be put into their design so that they can be correctly incorporated in frequency synthesizers. The main reason for this is two-fold [17]. On the one hand, the frequency tuning of an LC-VCO is done modifying the capacitance of an MOS varactor, whose variation is around 10% of its nominal value; this translates into a 5% variation in the oscillating frequency, a value that is typically not enough to encompass PVT variations.…”

Section: Frequency Synthesizermentioning

confidence: 99%

A Reconfigurable Radio-Frequency Converter IC in 0.18 µm CMOS

Sánchez-Azqueta¹,

Guerrero²,

Gimeno³

et al. 2019

Electronics

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This work presents a reconfigurable RF converter for DVB-T television applications using triple-play over GPON. The system takes the DVB-T input, a wavelength division multiplexing (WDM) signal with spectral inversion in the range from 47 M Hz –1000 M Hz , up-converts its frequency to the band-pass of a highly selective surface-acoustic wave (SAW) filter centered at 1 . 3 G Hz , and then down-converts it so that it is compatible with the antenna input of conventional television sets. The designed RF converter incorporates two pairs of frequency synthesizer and mixer, based, respectively, on an integer-N phase-locked loop (PLL) with two LC-tank VCOs with 128 coarse tuning bands in the range from 1.35 G Hz –2.7 G Hz , and a double-balanced Gilbert cell, modified for better impedance matching and improved linearity. It is fed with regulated supplies compensated in temperature and programmed by an I 2 C interface operating on five 16-bit registers. This work presents the experimental characterization of the whole system plus selected cells for stand-alone testing, which have been fabricated in a 0 . 18 m CMOS process.

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Section: Frequency Synthesizermentioning

confidence: 99%

A Reconfigurable Radio-Frequency Converter IC in 0.18 µm CMOS

Sánchez-Azqueta¹,

Guerrero²,

Gimeno³

et al. 2019

Electronics

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“…Voltage-Control Oscillator (VCO) is a critical module of PLL, and its performance directly influences the performance of PLL [6,7,8,9]. The VCO gain, K VCO , is a key parameter that affects the loop bandwidth, stability, and phase noise [10,11,12]. The LC VCO widely employs a switchable capacitor bank to extend the frequency tuning range [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Many methods to obtain small gain variation have been reported in references [15,16,17,18,19,20,21,22]. It can be seen from Eq.…”

Section: Introductionmentioning

confidence: 99%

“…However, the inductance used in the tunable NI cell occupies a large area. The seriesconnected capacitor bank and parallel-connected capacitor bank are connected to the varactor in series and parallel, respectively in [19]. However, the resistance of switching transistors in a series capacitor bank will degrade the quality factor (Q value) of the LC tank, so this technique will worsen the phase noise of VCO.…”

Section: Introductionmentioning

confidence: 99%

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A 5.67-8.75GHz LC VCO with small gain variation for 2.4GHz-band WLAN applications

Tian

Huang

et al. 2021

IEICE Electron. Express

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In this paper, a 5.67-8.75 GHz LC VCO with small gain variation and reconfigurable buffer for 2.4 GHz-band WLAN applications is presented and implemented in a Semiconductor Manufacturing International Corporation (SMIC) 55 nm CMOS process. The VCO gain is a strong function of the capacitance. For wide frequency tuning range meaning the large gain variation. The gain calibration scheme is proposed to obtain small gain variation across the frequency range. This letter proposes a reconfigurable buffer with adjustable amplitude, low jitter, and small supply coupling issues. The results show the proposed gain calibration scheme is very effective. The measured phase noise at 6.69 MHz offset is -123.2 dBc/Hz at 4.9 GHz output frequency.

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“…Recently, to achieve a wide range and low phase noise at the same time, several techniques, such as capacitive and inductive tunings, have been reported. By using a combination of the switched capacitor bank for coarse tuning and the Metal Oxide Semiconductor (MOS) varactor for fine-tuning, a wide tuning range can be obtained [3,4]. However, in the mm-Wave frequency band, due to the capacitor and varactor, the quality factor of the Inductor and Capacitor (LC) tank decreases.…”

Section: Introductionmentioning

confidence: 99%

A Design of Wide-Range and Low Phase Noise Linear Transconductance VCO with 193.76 dBc/Hz FoMT for mm-Wave 5G Transceivers

Hejazi

Lee

2020

Electronics

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This paper presents a wide-range and low phase noise mm-Wave Voltage Controlled Oscillator (VCO) based on the transconductance linearization technique. The proposed technique eliminates the deep triode region of the active part of the VCO, and lowers the noise introduced by the gm-cell. The switch sizes inside the switched capacitor bank of the VCO are optimized to minimize the resistance of the switches while keeping the wide tuning range. A new layout technique shortens the routing of the VCO outputs, and lowers the parasitic inductance and resistance of the VCO routing. The presented method prevents the reduction of the quality factor of the tank due to the long routing. The proposed VCO achieves a discrete frequency tuning range, of 14 GHz to 18 GHz, through a linear coarse and middle switched capacitor array, and offers superior phase noise performance compared to recent state-of-the-art VCO architectures. The design is implemented in a 45 nm CMOS process and occupies a layout area (including output buffers) of 0.14 mm2. The power consumption of the VCO core is 24 mW from the power supply of 0.8 V. The post-layout simulation result shows the VCO achieves the phase noise performances of −87.2 dBc/Hz and −113 dBc/Hz, at 100 kHz and 1 MHz offset frequencies from the carrier frequency of 14 GHz, respectively. In an 18 GHz carrier frequency, the results are −87.4 dBc/Hz and −110 dBc/Hz, accordingly.

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A 4.39–5.26 GHz LC-Tank CMOS Voltage-Controlled Oscillator With Small VCO-Gain Variation

Cited by 101 publications

References 8 publications

A Reconfigurable Radio-Frequency Converter IC in 0.18 µm CMOS

A Reconfigurable Radio-Frequency Converter IC in 0.18 µm CMOS

A 5.67-8.75GHz LC VCO with small gain variation for 2.4GHz-band WLAN applications

A Design of Wide-Range and Low Phase Noise Linear Transconductance VCO with 193.76 dBc/Hz FoMT for mm-Wave 5G Transceivers

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