VCO-Based ADC With Built-In Supply Noise Immunity Using Injection-Locked Ring Oscillators

Al-Tamimi, Karama M.; El‐Sankary, Kamal; Fouzar, Y.

doi:10.1109/tcsii.2018.2875867

Cited by 10 publications

(16 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In most designs, these auxiliary inverters will be sized significantly smaller than the main inverters. More specifically, a typical sizing for these auxiliary inverters is to size them a quarter of the main inverters [14], [25], [26]. This configuration will be later referred to as the direct cross-coupled case or Direct CC.…”

Section: B Differential Delay Cellsmentioning

confidence: 99%

The Analog Behavior of Pseudo Digital Ring Oscillators Used in VCO ADCs

Borgmans

Riem

Rombouts

2021

IEEE Trans. Circuits Syst. I

View full text Add to dashboard Cite

Section: B Differential Delay Cellsmentioning

confidence: 99%

The Analog Behavior of Pseudo Digital Ring Oscillators Used in VCO ADCs

Borgmans

Riem

Rombouts

2021

IEEE Trans. Circuits Syst. I

View full text Add to dashboard Cite

“…In this paper, the main objective in designing a CMOS differential stage as the one shown in Figure 1, which will be used to implement a ring VCO, is oriented to achieve the highest oscillation frequency f osc given in (1), which is inversely proportional to both the number of CMOS stages N and the propagation delay τ. Supposing N constant, then the delay generated by the differential pair must be minimized [14,23]. Some authors recommend that the delay can be reduced by augmenting the output transconductance g ds of the active MOS transistor and by reducing the equivalent capacitance, where the load capacitance C L could be the dominant one [13,23,24].…”

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%

“…The oscillation frequency f osc of a VCO can be evaluated by (1), where N indicates the number of stages and τ is a time constant that depends on the associated resistance of the active load and the value of the capacitor load. f osc varies in a range determined by a control voltage V ctrl [14], and depends on the number of CMOS differential stages N, but decreasing N yields a reduction in gain, which may result in the oscillation mitigation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Castañeda-Aviña

Tlelo‐Cuautle

Fraga

2020

MCA

View full text Add to dashboard Cite

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.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

VCO-Based ADC With Built-In Supply Noise Immunity Using Injection-Locked Ring Oscillators

Cited by 10 publications

References 11 publications

The Analog Behavior of Pseudo Digital Ring Oscillators Used in VCO ADCs

The Analog Behavior of Pseudo Digital Ring Oscillators Used in VCO ADCs

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

Contact Info

Product

Resources

About