A low-voltage low-power capacitive-feedback voltage controlled oscillator

Rastegar, Habib; Zare, Saeid; Ryu, Jee-Youl

doi:10.1016/j.vlsi.2017.10.008

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…The obtained tuning range for this condition is 26 per cent. The presented power dissipations are also much lower than some previously presented low-power ring and CMOS LC VCOs (Rastegar et al, 2018;Azadmousavi and Aghdam, 2018;Kumar, 2016;Ebrahimzadeh, 2011). The results in Figure 5 have rising behavior for the dissipation power when the control voltage increases especially when the control voltage is above 0.5 V. This is somehow expected because increasing the oscillation frequency would result in more switching dissipation power in the transistors.…”

Section: Simulationsmentioning

confidence: 66%

Proposed 3.5 µW CNTFET-MOSFET hybrid CSVCO for power-efficient gigahertz applications

Khorram

Kokabi

2020

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Purpose Several ultra-low power and gigahertz current-starved voltage-controlled oscillator (CSVCO) circuits have been proposed and compared here. The presented structures are based on the three-stage hybrid circuit of the carbon nanotube field-effect transistors (CNTFETs) and low-power MOSFETs. The topologies exploit modified and compensated Schmitt trigger comparator parts to demonstrate better consumption power and frequency characteristics. The basic idea in the presented topologies is to compensate the Schmitt trigger comparator part of the basic CSVCO for achieving faster carrier mobility of the holes, reducing transistor leakage current and eliminating dummy transistors. Design/methodology/approach This study aims to propose and compare three different comparator-based VCOs that have been implemented using the CNTFETs. The considered circuits are shown to be capable of delivering the maximum 35 tuning frequency in the order of 1 GHz to 5 GHz. A major power thirsty part of the high-frequency ring VCOs is the Schmitt trigger stage. Here, several fast and low-power Schmitt trigger topologies are exploited to mitigate the dissipation power and enhance the oscillation frequency. Findings As a result of proposed modifications, more than one order of magnitude mitigation in the VCO power consumption with respect to the previously presented three-stage CSVCO is reported here. Thus, a VCO dissipation power of 3.5 µW at the frequency of 1.1 GHz and the tuning range of 26 per cent is observed for the well-established 32 nm technology and the supply voltage of 1 V. Such a low dissipation power is obtained around the operating frequency of the battery-powered cellular phones. In addition, using the p-carrier mobility compensation and enhancing the rise time of the Schmitt trigger part of the CSVCO, a maximum of 2.38 times higher oscillation frequency and 72 per cent wider tuning range with respect to Rahane and Kureshi (2017) are observed. Simultaneously, this topology exhibits an average of 20 per cent reduction in the power consumption. Originality/value Several new VCO topologies are presented here, and it is shown that they can significantly enhance the power dissipation of the GHz CSVCOs.

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Section: Simulationsmentioning

confidence: 66%

Proposed 3.5 µW CNTFET-MOSFET hybrid CSVCO for power-efficient gigahertz applications

Khorram

Kokabi

2020

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“…In addition, the capacitance of the tail effectively filters out high-frequency noise caused by the bias current [230]. The QVCO configuration is better to provide negative conductance and also relatively low power consumption because the drain terminal provides the current, and this current could be reused by the back gate method [5], [124] as shown in Fig. 26 [124].…”

Section: A Nmos Cross-coupled Lc Oscillatormentioning

confidence: 99%

“…T He need for precise and low-power features in wireless personal digital assistance devices has grown in recent years, which emphasizes the need for RF designers to work within the ultimate limits of technology [1]- [4]. It is identified that in recent years, voltage-controlled oscillators (VCO) have been extensively designed, as it was the most prominent building block in the Phase-Locked Loop (PLL) system, which could generate a stable frequency [5]- [9]. The VCO designers have addressed parameters like good phase noise, low power, tuning range, smaller area, lower Figure of Merit (FOM), and cost [9], [10].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

Sivaraaj,

Majeed

2023

IEEE Access

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Voltage-controlled Oscillator (VCO) is a prominent part that has been used to generate a stable frequency for the high-frequency transceiver system. This survey encompasses a comparative analysis of two commonly used VCO architectures: the Ring VCO and LC-VCO. The Ring VCO has been constructed with the collection of ring delay cells. Moreover, the LC-VCO utilizes inductors, capacitors, fine-tuning circuits, coarse-tuning circuits to generate frequency. Furthermore, this study investigates an in-depth exploration of VCO structures, operational principles, advantages, limitations, and performance metrics. In addition, it evaluates performance parameters, including operating frequency range, phase noise, figure of merit, and tuning techniques. This research suggests that based on the application and its requirements, the VCO performance parameters need to be varied. This survey employs diverse types of VCO, and its design methods. Implications for future research and study of VCO design and integration are discussed.

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A 24 GHz Wide-Tuning-Range CMOS Digitally Controlled Oscillator for Automotive Radar

Siddique

Delwar

Jana³

et al. 2021

Research in Intelligent and Computing in Engineering

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A low-voltage low-power capacitive-feedback voltage controlled oscillator

Cited by 7 publications

References 17 publications

Proposed 3.5 µW CNTFET-MOSFET hybrid CSVCO for power-efficient gigahertz applications

Proposed 3.5 µW CNTFET-MOSFET hybrid CSVCO for power-efficient gigahertz applications

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

A 24 GHz Wide-Tuning-Range CMOS Digitally Controlled Oscillator for Automotive Radar

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