A 1-V 4-GHz wide tuning range voltage-controlled ring oscillator in 0.18 μm CMOS

Sheu, Meng-Lieh; Tiao, Yu-Shang; Taso, Lin-Jie

doi:10.1016/j.mejo.2011.03.015

Cited by 47 publications

(18 citation statements)

References 12 publications

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“…(1) Where N is the total number of stages and is the propagation delay of each stage. According to (1) the frequency of oscillation can be increased by decreasing the number of stages and decreasing the delay through single stage [3].…”

Section: Circuit Descriptionmentioning

confidence: 99%

“…Tuning becomes difficult in such low values of v_ctrl. Therefore, transistors M P5 and M P6 are used by [1] as against [3] to enhance the tuning range even when M N3 and M N4 are turned off (Fig.2 (b)). …”

Section: A Multiple-pass Ring Oscillatorsmentioning

confidence: 99%

“…shows the reference delay cells presented by[3] and[1] respectively. Transistors M N1 and M N2 are the input transistors to which the primary inputs are connected.…”

mentioning

confidence: 99%

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A low phase noise CMOS voltage-controlled differential ring oscillator

Rahul

Thilagavathy

2014

2014 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT)

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The paper presents a novel low phase noise voltage-controlled ring oscillator designed in UMC 0.18μm technology. The proposed design contains nine stages of differential delay cells with multiple-pass loop architecture. Linear frequency -voltage characteristics are exhibited over a wide tuning range. The tuning range of nine-stage ring oscillator is 1.1-2.3 GHz. A phase noise of -108.13dBc/Hz was estimated at an offset of 1MHz from a center frequency of 1.8 GHz. The design uses a 1.8V supply and consumes a maximum power of 65mW while operating at 1.8GHz.

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Section: Circuit Descriptionmentioning

confidence: 99%

Section: A Multiple-pass Ring Oscillatorsmentioning

confidence: 99%

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A low phase noise CMOS voltage-controlled differential ring oscillator

Rahul

Thilagavathy

2014

2014 International Conference on Control, Instrumentation, Communication and Computational Technologies (ICCICCT)

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“…The PLL is a closed‐loop feedback system that estimates the frequency and phase angle of its input signals when it is in lock. On the other hand, oscillator is an amplifier with the positive feedback loop in which the frequency is the function of the voltage …”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, oscillator is an amplifier with the positive feedback loop in which the frequency is the function of the voltage. [2][3][4][5][6][7] VCOs can be classified in two types: the LC-VCO and ring-VCO. 1 Each type has different frequency tuning methods.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of differential ring voltage controlled oscillator for wide tuning range and low power applications

Аскари

Saneei

2018

Circuit Theory & Apps

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Summary Voltage‐controlled oscillator (VCO) is the most basic component required for all wireless and communication systems. In this article, a four‐stage differential ring VCO with two control voltages for wide tuning range is proposed. This VCO uses the dual‐delay loop technique for high operation frequency. Also, a low‐VT NMOS transistor is used in series with pull down network of the proposed VCO delay cell to achieve low frequencies. Prelayout simulation of the proposed VCO is performed in 65‐nm TSMC CMOS technology in Cadence software under 1.2‐V supply voltage. The tuning range of the proposed VCO varies from 1 MHz to 13.8 GHz and has been improved by 19.77% compared to other works. The power consumption of this low power VCO is between 29.3 μW to 1.715 mW. The phase noise of the proposed circuit is −82.3 dBc/Hz at 1 MHz offset frequency and −106.9 dBc/Hz at 10 MHz offset frequency from 5.161 GHz center frequency, while its area is 102.457 μm2. This design demonstrates other benefits in low power consumption and area compared with other ring oscillators.

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Novel six‐phase ring voltage controlled oscillator with wide frequency tuning range

Hemmati,

Dehghani

2024

Circuit Theory & Apps

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SummaryThis paper presents more compatible three‐stage inverter‐based ring voltage controlled oscillators (VCOs) by modifying the current‐starved delay cell to oscillate with high tuning range. Unlike some ring structures in which extra transistors are used as current boosting to enhance the frequency tuning range, no extra elements are used in the proposed three‐stage VCOs for increasing the tuning range. Besides, a new method is introduced to couple two proposed ring VCOs for designing a six‐phase ring VCO. The coupling method can be generalized to some other ring VCOs to generate multiphase signals. The proposed circuits have wide frequency tuning ranges and show good noise performances. The proposed six‐phase VCO can oscillate from 1.62 GHz to 3.45 GHz, which illustrates 72.2% tuning range. The phase noise of the proposed VCO is −97.5 dBc/Hz at 1 MHz offset frequency. The circuit figure of merit is −181.5 dBc/Hz. The post‐layout simulation results of the proposed six‐phase VCO are provided based on the TSMC 0.18 μm CMOS process.

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A 1-V 4-GHz wide tuning range voltage-controlled ring oscillator in 0.18 μm CMOS

Cited by 47 publications

References 12 publications

A low phase noise CMOS voltage-controlled differential ring oscillator

A low phase noise CMOS voltage-controlled differential ring oscillator

Design and analysis of differential ring voltage controlled oscillator for wide tuning range and low power applications

Novel six‐phase ring voltage controlled oscillator with wide frequency tuning range

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