A 0.65-V process variation and supply noise insensitive ring VCO

Yan, Chenggang; Hu, Chen

doi:10.1080/00207217.2017.1357204

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…A four-stage feed-forward ring VCO with a load capacitor (Yan and Hu, 2018) has been introduced to deal with process variations and supply noise. The offered VCO is suitable for low-power applications of VCO.…”

Section: Introductionmentioning

confidence: 99%

Supply less sensitive ring voltage-controlled oscillator for microwave L-band frequencies

Trivedi

Tiwari

2022

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Purpose The primary aim of this paper is to present a novel design approach for a ring voltage-controlled oscillator (VCO) suitable for L-band applications, whose oscillation frequency is less sensitive to power supply variations. In a few decades, with the advancement of modern wireless communication equipment, there has been an increasing demand for low-power and robust communication systems for longer battery life. A sudden drop in power significantly affects the performance of the VCO. Supply insensitive circuit design is the backbone of uninterrupted VCO performance. Because of their important roles in a variety of applications, VCOs and phase locked loops (PLLs) have been the subject of significant research for decades. For a few decades, the VCO has been one of the major components used to provide a local frequency signal to the PLL. Design/methodology/approach First, this paper chose to present recent developments on implemented techniques of ring VCO design for various applications. A complementary metal oxide semiconductor (CMOS)-based supply compensation technique is presented, which aims to reduce the change in oscillation frequency with the supply. The proposed circuit is designed and simulated on Cadence Virtuoso in 0.18 µm CMOS process under 1.8 V power supply. Active differential configuration with a cross-coupled NMOS structure is designed, which eliminates losses and negates supply noise. The proposed VCO is designed for excellent performance in many areas, including the L-band microwave frequency range, supply sensitivity, occupied area, power consumption and phase noise. Findings This work provides the complete design aspect of a novel ring VCO design for the L-band frequency range, low phase noise, low occupied area and low power applications. The maximum value of the supply sensitivity for the proposed ring VCO is 1.31, which is achieved by changing the VDD by ±0.5%. A tuning frequency range of 1.47–1.81 GHz is achieved, which falls within the L-band frequency range. This frequency range is achieved by varying the control voltage from 0.0 to 0.8 V, which shows that the proposed ring VCO is also suitable for low voltage regions. The total power consumed by the proposed ring VCO is 14.70 mW, a remarkably low value using this large transistor count. The achievable value of phase noise is −88.76 dBc/Hz @ 1 MHz offset frequency, which is a relatively small value. The performance of the proposed ring VCO is also evaluated by the figure of merit, achieving −163.13 dBc/Hz, which assures the specificity of the proposed design. The process and temperature variation simulations also validate the proposed design. The proposed oscillator occupied an extremely small area of only 0.00019 mm2 compared to contemporary designs. Originality/value The proposed CMOS-based supply compensation method is a unique design with the size and other parameters of the components used. All the data and results obtained show its originality in comparison with other designs. The obtained results are preserved to the fullest extent.

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Section: Introductionmentioning

confidence: 99%

Supply less sensitive ring voltage-controlled oscillator for microwave L-band frequencies

Trivedi

Tiwari

2022

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“…In previous works, many researchers have focused on low power consumption in two stage ring VCOs [19,20,21,22] and others focused on linearly or wide frequency tuning range of ring VCOs [23,24,25,26,27,28]. The authors of [19,20] designed the ring VCOs with low supply voltage to reduce power dissipation. However, the oscillating frequency in these architectures is more sensitive to supply voltage and the frequency tuning range is limited by the low supply voltage.…”

Section: Introductionmentioning

confidence: 99%

A low power wide tuning range two stage ring VCO with frequency enhancing

Yan¹,

Wu²,

Hu³

et al. 2019

IEICE Electron. Express

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A wide tuning range frequency enhanced two stage ring voltage controlled oscillator (VCO) is proposed in this letter. The proposed delay cell increases the transmission gain by inserting a resistor between input and output, which consumes lower power to generate same oscillating frequency. A rail-to-rail effective voltage tuning range is obtained by both tuning of tail current and the strength of cross coupled latch. It is important for advanced process, which has low standard supply voltage and high threshold voltage. The proposed VCO is fabricated in TSMC 40 nm CMOS technology. The measured phase noise of proposed VCO is −98.05 dBc/Hz at 1 MHz offset with 1.38 GHz carrier frequency while consuming 1.1 mW from a 1.1 V standard supply. The figure of merit (FoM) is 160.4 dBc/Hz.

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Multi‐phase feedforward ring VCO with high frequency and low phase noise

et al. 2020

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A novel feedforward‐coupling ring oscillator (FRVCO) is presented. A comparative study in terms of oscillation frequency and phase noise is conducted between the proposed model and the traditional FRVCO. Due to the improved delay cell, high oscillation frequency, low phase noise and uniform multi‐phase output can be achieved. Compared with the traditional FRVCO, under the same design parameters, the FRVCO proposed in this Letter can increase the oscillation frequency by 10% while reducing the phase noise at 1 MHz by at least 10 dB.

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A 0.65-V process variation and supply noise insensitive ring VCO

Cited by 7 publications

References 16 publications

Supply less sensitive ring voltage-controlled oscillator for microwave L-band frequencies

Supply less sensitive ring voltage-controlled oscillator for microwave L-band frequencies

A low power wide tuning range two stage ring VCO with frequency enhancing

Multi‐phase feedforward ring VCO with high frequency and low phase noise

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