A VCO With Extra Cross-Coupling Path

Wan, Cao; Xu, Taotao; Yi, Xiang; Xue, Quan

doi:10.1109/lmwc.2021.3102028

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The citations cover a wide range of topics related to oscillator design, including low-phase noise design, low-power operation, frequency dividers, and various techniques for improving VCO performance. There are some recent works but with different CMOS process, techniques, and carrier frequency are cited in [27][28][29][30][31].…”

Section: Comparison With Previous Workmentioning

confidence: 99%

Design and Optimization of an Ultra-Low-Power Cross-Coupled LC VCO with a DFF Frequency Divider for 2.4 GHz RF Receivers Using 65 nm CMOS Technology

Siddiqui,

Maheshwari,

Raza

et al. 2023

JLPEA

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This article presents the design and optimization of a tunable quadrature differential LC CMOS voltage-controlled oscillator (VCO) with a D flip-flop (DFF) frequency divider. The VCO is designed for the low-power and low-phase-noise applications of 2.4 GHz IoT/BLE receivers and wireless sensor devices. The proposed design comprises the proper stacking of an LC VCO and a DFF frequency divider and is simulated using a TSMC 65 nm CMOS technology, and it has a tuning range of 4.4 to 5.7 GHz. The voltage headroom is preserved using a high-impedance on-chip passive inductor at the tail for filtering and enabling true differential operation. The VCO and frequency divider consume as low as 2.02 mW altogether, with the VCO section consuming only 0.47 mW. The active area of the chip including the pads is only 0.47 mm2. The designed VCO achieved a much better phase noise of −118.36 dBc/Hz at a 1 MHz offset frequency with 1.2 V supply voltages. The design produced a much better FoM of −196.44 dBc/Hz compared to other related research.

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Section: Comparison With Previous Workmentioning

confidence: 99%

Design and Optimization of an Ultra-Low-Power Cross-Coupled LC VCO with a DFF Frequency Divider for 2.4 GHz RF Receivers Using 65 nm CMOS Technology

Siddiqui,

Maheshwari,

Raza

et al. 2023

JLPEA

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show abstract

“…In general, the cross-coupled VCO is popular for GHz-order RF systems because of its low-phase noise characteristics [1]. Accordingly, studies on various modified VCOs based on the cross-coupled type have been actively conducted [2][3][4][5][6][7][8][9]. However, as RF systems become more sophisticated to cover a higher data rate, further improvements in the phase noise of the VCO are required.…”

Section: Introductionmentioning

confidence: 99%

Layout of MOS Varactor with Improved Quality Factor for Cross-Coupled Differential Voltage-Controlled Oscillator Applications

Lee

Park

2023

Electronics

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In this study, we designed an MOS varactor for application in the differential voltage-controlled oscillator (VCO). To improve the quality factor of the MOS varactor, we proposed a symmetric layout technique of the MOS varactor with reduced parasitic components. Compared with the typical MOS varactor layout, the metal line for the interconnection of the MOS varactors that is inevitable in the typical MOS varactors for the cross-coupled VCO was minimized to reduce the parasitic resistance. In addition, with the reduced interconnection metal line, the overall size of the proposed MOS varactor was also reduced compared with the typical one. To verify the feasibility of the proposed MOS varactor structure, the typical and proposed MOS varactors were designed using a 180 nm RFCMOS process. Compared to the typical MOS varactor, the measured quality factor of the proposed MOS varactor was improved by approximately 32% at the operating frequency of 5.0 GHz. Additionally, we successfully verified that the parasitic capacitance induced by the lossy silicon substrate was reduced in the proposed MOS varactor structure.

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A 5.99-GHz VCO With Wideband-Differential-Mode Second Harmonic Resonance Achieving −138.9 dBc/Hz Phase Noise at an Offset of 10 MHz

Yang,

Chen,

Huang

et al. 2024

IEEE Microw. Wireless Tech. Lett.

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A VCO With Extra Cross-Coupling Path

Cited by 4 publications

References 12 publications

Design and Optimization of an Ultra-Low-Power Cross-Coupled LC VCO with a DFF Frequency Divider for 2.4 GHz RF Receivers Using 65 nm CMOS Technology

Design and Optimization of an Ultra-Low-Power Cross-Coupled LC VCO with a DFF Frequency Divider for 2.4 GHz RF Receivers Using 65 nm CMOS Technology

Layout of MOS Varactor with Improved Quality Factor for Cross-Coupled Differential Voltage-Controlled Oscillator Applications

A 5.99-GHz VCO With Wideband-Differential-Mode Second Harmonic Resonance Achieving −138.9 dBc/Hz Phase Noise at an Offset of 10 MHz

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