A 0.18-μm 10-GHz CMOS Ring Oscillator for Optical Transceivers

Liu, Hai Qi; Goh, Wang Ling; Siek, Liter

doi:10.1109/iscas.2005.1464890

Cited by 10 publications

(2 citation statements)

References 9 publications

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“…Unfortunately, the tuning characteristics of an inductorless ring VCO are usually much worse than that of its LC counterpart. Two representative delay cells presented in [6] and [7] respectively are shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

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A CMOS high-performance inductorless ring VCO with extended monotonic tuning voltage range

Zhang

Wang

Fang

et al. 2018

IEICE Electron. Express

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A high-performance inductorless ring VCO with wide tuning range and extended monotonic tuning voltage range (MTVR) is proposed and fabricated in standard 0.18 µm CMOS technology. By combining the crossing-strength-tuning and load-resistance-tuning techniques with opposite tuning characteristics, the MTVR for the proposed VCO can be widened significantly. The dual-delay path technique is employed to improve the oscillating frequency. The cross-coupled pair is added to reduce phase noise and guarantee reliable differential-mode oscillation over the wide tuning voltage range. With an occupied area of 475 µm × 275 µm and a single supply voltage of 1.8 V, measurement results show the proposed VCO can oscillate with a frequency range from 1.57 to 2.76 GHz, phase noise of −91.12 dBc/Hz @ 1 MHz and FOM T of 164.5 dBc/Hz @ 1 MHz and extended MTVR.

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Section: Introductionmentioning

confidence: 99%

“…Schematic diagrams of two delay cells presented in[6] (a) and in[7] (b) respectively the delay for each delay cell and then tune the oscillation frequency of the aimed ring VCO.…”

mentioning

confidence: 99%

A CMOS high-performance inductorless ring VCO with extended monotonic tuning voltage range

Zhang

Wang

Fang

et al. 2018

IEICE Electron. Express

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Wide Frequency Multiphase Oscillator Designed by Coupling Two Identical Ring Voltage Controlled Oscillators

Hemmati,

Mood,

Dehnavi

2024

Circuit Theory & Apps

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This work presents a novel wide tuning range ring voltage controlled oscillator (RVCO) designed to generate six‐phase signals. The proposed circuit is realized by coupling two identical three‐stage single‐ended inverter‐based RVCOs. The coupling network injects the common mode signals from one RVCO to the other one and vice versa in a cross‐connected manner. Three‐stage RVCOs used for coupling have been configured by modifying the conventional current‐starved RVCO. The proposed six‐phase RVCO is optimized using an improved version of non‐dominated Sorting Genetic Algorithm III (NSGAIII). In this algorithm, the sigma scaling method is used to control selection pressure and enhance the algorithm's performance. The proposed RVCO oscillates at 3.46 GHz. It can operate from 970 MHz to 4 GHz with a supply voltage of 1.5 V, demonstrating a wide frequency tuning range of 120%. Additionally, another six‐phase oscillator is proposed, achieved by capacitively coupling two identical three‐stage RVCOs. Both proposed oscillators are designed in TSMC 0.18 μm CMOS technology.

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A low-noise wide range delta-sigma frequency synthesizer for DTV broadband

Liao

Hung

2010

2010 17th IEEE International Conference on Electronics, Circuits and Systems

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The proposed low noise wide frequency range Phase Loco Loop (PLL) proposed in TSMC O.18-um CMOS technology is developed for DTV broadband. It incorporates a Extended Multi-band Ring Voltage Control Oscillator (VCO) to enhance the frequency selection range of the conventional Multi-band Ring VCO accomplishing a wide frequency range and better phase noise PLL. This frequency synthesizer is measured the phase noise of -97.1 dBclHz at 3MHz offset frequency and reference spurs below -69.78dBc at 36MHz offset. The VCO gain Kyco (73MHzJV� 328MHzJV) is improved by using the Extended Multi-band Ring VCO obtaining a better phase noise performance than the conventional Multi-band Ring VCO structure.

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A 0.18-μm 10-GHz CMOS Ring Oscillator for Optical Transceivers

Cited by 10 publications

References 9 publications

A CMOS high-performance inductorless ring VCO with extended monotonic tuning voltage range

A CMOS high-performance inductorless ring VCO with extended monotonic tuning voltage range

Wide Frequency Multiphase Oscillator Designed by Coupling Two Identical Ring Voltage Controlled Oscillators

A low-noise wide range delta-sigma frequency synthesizer for DTV broadband

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