A 5-GHz CMOS LC Quadrature VCO With Dynamic Current-Clipping Coupling to Improve Phase Noise and Phase Accuracy

Lo, Yung-Chung; Silva-Martí­nez, J.

doi:10.1109/tmtt.2013.2264940

Cited by 35 publications

(20 citation statements)

References 22 publications

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“…Fig. 5 shows the schematic of the QVCO using a dynamic current-clipped technique [5]. The coupling transconductance is built by two transistors M CUP and M CDN whose gate terminals are connected to the differential phases of the other LC branch.…”

Section: B Qvcomentioning

confidence: 99%

A 0.6ps jitter 2–16 GHz 130nm CMOS frequency synthesizer for broadband applications

Rashidi

Hwang

et al. 2015

2015 IEEE International Symposium on Circuits and Systems (ISCAS)

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A low-power 2-16 GHz frequency synthesizer fabricated in 130nm CMOS technology is presented. A singlesideband mixer combines feed-forward and regenerative mixing techniques as well as frequency divide-by-two circuits to achieve the wide frequency range. A dynamic current-clipped QVCO that exhibits excellent phase noise and outstanding quadrature phase accuracy is developed. The frequency synthesizer fabricated in 130nm CMOS technology achieves 0.6ps jitter and spurs tones under -42dBc while consuming a maximum power of 64mW with 1.2/1.8V power supplies.Keywords-Cognitive Radio, Wide band frequency synthesizer; quadrature voltage-controlled oscillator; tunable CML frequency divider.

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Section: B Qvcomentioning

confidence: 99%

A 0.6ps jitter 2–16 GHz 130nm CMOS frequency synthesizer for broadband applications

Rashidi

Hwang

et al. 2015

2015 IEEE International Symposium on Circuits and Systems (ISCAS)

Self Cite

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“…In conclusion, we have shown that for transformer-based oscillators the traditional quality Although, the architecture is claimed to naturally stabilize in the high frequency quadrature mode [36,22], in some cases the oscillator can jump between these two modes during operation, or start up in a mode other than the one intended [50]. Several solutions have been proposed; most involve introducing a phase delay into the coupling path [50][51][52]. While successful in solving the bi-modal oscillation problem, this phase delay reduces the effectiveness of current tuning in QVCOs.…”

Section: Resultsmentioning

confidence: 99%

Methods and techniques for improving the figure of merit for wide tuning range quadrature voltage controlled oscillators

Gouhary

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In addition, I would like to thank my friend at Iowa State University, Sara Harris, the department secretary, who was always there for me and all the VLSI graduate students for being such wonderful and helpful friends.Last but not least, I would like to thank my husband and my two beautiful daughters for their love and support.x ABSTRACT Next generation wireless devices will be required to support a wide variety of commercial standards and operate over a wide range of frequency bands. Two examples that are already receiving a lot of attention are software-defined and cognitive radios. Therefore, components that are capable of operating over ultra-wide frequency ranges are required.Quadrature oscillators are a major component in any communication system. They are often

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“…property indicates for the circuits shows in However the degeneration resistor should be large enough to force transistor 2 to enter the triode region when + is high, otherwise will exhibit peaks at both the maximum and the minimum of + , as shown in Figure 3.7(b). Such approach has been suggested in [72]. However the coupling circuitry proposed in [72] consumes considerable DC power.…”

Section: Quadrature Vcomentioning

confidence: 99%

“…Such approach has been suggested in [72]. However the coupling circuitry proposed in [72] consumes considerable DC power.…”

Section: Quadrature Vcomentioning

confidence: 99%

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Design and analysis of amplitude and phase tunable VCO for ISM band application

Zhang¹

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Oscillators are an integral part of many electronic systems. With rapid development in the area of Radio Frequency (RF) and wireless communication, the interest in oscillator which generates Local Oscillator (LO) signal has grown rapidly in the last few years. The LO signal is required to down-convert the RF signal to a lower Intermediate Frequency (IF) signal, or vice versa. For typical RF application, LC Voltage-Controlled Oscillator (VCO) is used. It is essential to tune the VCO for an optimized performance due to two reasons. Firstly, the phase noise of the VCO has great effect on the selectivity of the receiver. Secondly, VCO is one of the most power hungry blocks of the transceiver. Hence the power consumption of the transceiver can be reduced significantly by optimizing that of the VCO. Moreover, for transceivers that implement quadrature modulation/demodulation scheme, the phase error and amplitude error of the LO signal can affect the function of the overall performance significantly. With the development and popularity of Wireless Local Area Network (WLAN) and Personal Area Networks (PANs) which operates in the Industrial, Scientific and Medical (ISM) band, it is essential to design VCO with optimized performance for ISM band application. In this thesis, the aim is to explore the VCO's tuning method, both differential and quadrature, to optimize the overall performance. Firstly, a fully integrated hybrid type Automatic Amplitude Calibration (AAC) VCO has been designed and fabricated in 0.18 µm CMOS technology. The operation of the whole loop and the state-dependent nature is analyzed followed by the analysis of important blocks. Based on these analyses, a quantitative transient analysis Abstract II for the whole loop is performed. A systematic design procedure is proposed according to the relationship explored in the quantitative transient analysis. Secondly, in order to satisfy the need for quadratuer signal generation with good phase noise and phase error performance, a novel in-phase coupling scheme is proposed. The principle of this in-phase coupling scheme is analyzed first, followed by the analysis for possible sources of phase error. Based on this analysis, two novel schemes for phase error tuning are proposed.

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A 5-GHz CMOS LC Quadrature VCO With Dynamic Current-Clipping Coupling to Improve Phase Noise and Phase Accuracy

Cited by 35 publications

References 22 publications

A 0.6ps jitter 2–16 GHz 130nm CMOS frequency synthesizer for broadband applications

A 0.6ps jitter 2–16 GHz 130nm CMOS frequency synthesizer for broadband applications

Methods and techniques for improving the figure of merit for wide tuning range quadrature voltage controlled oscillators

Design and analysis of amplitude and phase tunable VCO for ISM band application

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A 5-GHz CMOS LC Quadrature VCO With Dynamic Current-Clipping Coupling to Improve Phase Noise and Phase Accuracy

Cited by 35 publications

References 22 publications

A 0.6ps jitter 2&#x2013;16 GHz 130nm CMOS frequency synthesizer for broadband applications

A 0.6ps jitter 2&#x2013;16 GHz 130nm CMOS frequency synthesizer for broadband applications

Methods and techniques for improving the figure of merit for wide tuning range quadrature voltage controlled oscillators

Design and analysis of amplitude and phase tunable VCO for ISM band application

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Product

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A 0.6ps jitter 2–16 GHz 130nm CMOS frequency synthesizer for broadband applications

A 0.6ps jitter 2–16 GHz 130nm CMOS frequency synthesizer for broadband applications