A 0.5–1.1-V Adaptive Bypassing SAR ADC Utilizing the Oscillation-Cycle Information of a VCO-Based Comparator

Ding, Zhaoming; Zhou, Xiong; Li, Qiang

doi:10.1109/jssc.2018.2885554

Cited by 37 publications

(14 citation statements)

References 20 publications

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“…Additionally, the scaling down of technology nodes enables faster devices and higher time-domain resolution, making time-domain comparators increasingly popular in lowpower SAR ADCs. Voltage-controlled oscillator (VCO) based closed-loop [29] and voltage-controlled delay line (VCDL) based open-loop time-domain comparators [30] are proposed and demonstrated to achieve high power efficiency.…”

Section: B Analog To Digital Convertersmentioning

confidence: 99%

Recent Trends and Future Prospects of Neural Recording Circuits and Systems: A Tutorial Brief

Jinbo

Tarkhan

et al. 2022

IEEE Trans. Circuits Syst. II

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Recent years have seen fast advances in neural recording circuits and systems as they offer a promising way to investigate real-time brain monitoring and the closed-loop modulation of psychological disorders and neurodegenerative diseases. In this context, this tutorial brief presents a concise overview of concepts and design methodologies of neural recording, highlighting neural signal characteristics, system-level specifications and architectures, circuit-level implementation, and noise reduction techniques. Future trends and challenges of neural recording are finally discussed.

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Section: B Analog To Digital Convertersmentioning

confidence: 99%

Recent Trends and Future Prospects of Neural Recording Circuits and Systems: A Tutorial Brief

Jinbo

Tarkhan

et al. 2022

IEEE Trans. Circuits Syst. II

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“…(G) and source (S) terminals of the MOS transistors, and its associated threshold voltage V TH . The width (W) and length (L) sizes of the MOS transistors can be evaluated by (2), where I D is the drain current, and µ n C ox are parameters provided by the CMOS technology foundry. In this work the sizing is performed by using 180 nanometers (nm) from United Microelectronics Corporation (UMC).…”

Section: Ring Vco-based On Cmos Differential Stagesmentioning

confidence: 99%

“…The voltage-controlled oscillator (VCO) is quite useful in applications such as: analog-to-digital converters [1][2][3], phase-locked loops [4], and so on. The VCO can be implemented by using complementary metal-oxide-semiconductor (CMOS) technology of integrated circuits, as already shown in [5], and also by using LC-tank structures.…”

Section: Introductionmentioning

confidence: 99%

Single-Objective Optimization of a CMOS VCO Considering PVT and Monte Carlo Simulations

Castañeda-Aviña

Tlelo‐Cuautle

Fraga

2020

MCA

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The optimization of analog integrated circuits requires to take into account a number of considerations and trade-offs that are specific to each circuit, meaning that each case of design may be subject to different constraints to accomplish target specifications. This paper shows the single-objective optimization of a complementary metal-oxide-semiconductor (CMOS) four-stage voltage-controlled oscillator (VCO) to maximize the oscillation frequency. The stages are designed by using CMOS current-mode logic or differential pairs and are connected in a ring structure. The optimization is performed by applying differential evolution (DE) algorithm, in which the design variables are the control voltage and the transistors’ widths and lengths. The objective is maximizing the oscillation frequency under the constraints so that the CMOS VCO be robust to Monte Carlo simulations and to process-voltage-temperature (PVT) variations. The optimization results show that DE provides feasible solutions oscillating at 5 GHz with a wide control voltage range and robust to both Monte Carlo and PVT analyses.

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“…It is worth mentioning that designing VCOs is a challenge [4][5][6]; besides, one can find guidelines to deal with modern design issues, such as ultra-low-power requirements [7]. Other important applications require robust VCOs, such as in designing analog-to-digital converters [8,9] or phase-locked loops [10]. Some VCOs are designed using complex devices such as negative differential resistances [11], and others such as the one introduced herein use blocks connected in a ring topology [12].…”

Section: Introductionmentioning

confidence: 99%

Design of a Wide-Band Voltage-Controlled Ring Oscillator Implemented in 180 nm CMOS Technology

et al. 2019

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The design of a wide-band voltage-controlled oscillator (VCO) modified as a VCO with programmable tail currents is introduced herein. The VCO is implemented by using CMOS current-mode logic stages, which are based on differential pairs that are connected in a ring topology. SPICE simulation results show that the VCO operates within the frequency ranges of 2.65–5.65 GHz, and when it is modified, the VCO with programmable tail currents operates between 1.38 GHz and 4.72 GHz. The design of the CMOS differential stage is detailed along with the symbolic approximation of its dominant pole, which is varied to increase the frequency response in order to achieve a higher oscillation frequency when implementing the ring oscillator structure. The layout of the VCO is described and pre- and post-layout simulations are provided, which are in good agreement using CMOS technology of 180 nm. Finally, process, voltage and temperature variations are performed to guarantee robustness of the designed CMOS ring oscillator.

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A 0.5–1.1-V Adaptive Bypassing SAR ADC Utilizing the Oscillation-Cycle Information of a VCO-Based Comparator

Cited by 37 publications

References 20 publications

Recent Trends and Future Prospects of Neural Recording Circuits and Systems: A Tutorial Brief

Recent Trends and Future Prospects of Neural Recording Circuits and Systems: A Tutorial Brief

Single-Objective Optimization of a CMOS VCO Considering PVT and Monte Carlo Simulations

Design of a Wide-Band Voltage-Controlled Ring Oscillator Implemented in 180 nm CMOS Technology

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