A 600-μm² Ring-VCO-Based Hybrid PLL Using a 30-μW Charge-Sharing Integrator in 28-nm CMOS

Yang, Shiheng; Yin, Jun; Xu, Ting; Yi, Taimo; Mak, Pui-In; Li, Qiang; Martins, Rui P.

doi:10.1109/tcsii.2021.3096193

“…Oscillators are important building blocks of analog and digital systems. A ring oscillator (ROSC) is commonly used for generating sinusoidal signals for various applications such as true random number generator [1], current to voltage converter for temperature sensor [2], aging sensor [3], analog and digital converters [4], [5], phase-locked loop [6], for calibrating baseline interconnect path [7]. A ROSC is preferred because it has a robust and compact design and a wide tuning range.…”

Section: Introductionmentioning

confidence: 99%

“…In most of the applications, tuning of frequency is required [2], [4]- [10]. The tuning of frequency can be done by connecting different capacitive loads at the output node [6] or by varying supply current [2], [4], [5], [7]- [9]. The large area of capacitors is one of the drawbacks of the capacitive loadbased frequency tuning technique.…”

Section: Introductionmentioning

confidence: 99%

“…The large area of capacitors is one of the drawbacks of the capacitive loadbased frequency tuning technique. Moreover, to select different capacitors for frequency tuning, a controlled switch logic is required [6], which adds to additional complexity in circuitry. On the other hand, current-controlled ROSC can be designed such that by varying a control voltage, the supply current can be adjusted for frequency tuning [2].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Differential Delay Cell for Ring Oscillators

Singh¹,

SINGH²,

Sakare³

2023

Preprint

0

View full text Add to dashboard Cite

<p>This paper presents a differential delay cell (DDC) for a 3-stage current-starved ring voltage-controlled oscillator (CSRVCO). In the proposed delay cell, pass transistors and a pair of back-to-back transistors are connected in a symmetric structure that helps get less jittery output by providing similar charging and discharging paths from the load capacitor. The current flows from similar paths with the same type and number of transistors in the proposed DDC-based CSRVCO. For verifying the DDC operation, the 3-stage CSRVCO using the proposed DDC is implemented with a standard 65nm CMOS technology with 1V supply. Post-layout simulation results confirm the correct operation of the proposed DDC using the CSRVCO with minimal jitter at the output. The proposed CSRVCO can be tuned from 0.88 GHz to 2.76 GHz. The phase noise of -94.54 dBc Hz was measured at 1MHz offset frequency for the center frequency of 2.76 GHz. The CSRVCO was designed using the proposed DDC occupied area 1198.43 μm2, and dissipated power is 5.19mW.</p>

show abstract

“…Oscillators are important building blocks of analog and digital systems. A ring oscillator (ROSC) is commonly used for generating sinusoidal signals for various applications such as true random number generator [1], current to voltage converter for temperature sensor [2], aging sensor [3], analog and digital converters [4], [5], phase-locked loop [6], for calibrating baseline interconnect path [7]. A ROSC is preferred because it has a robust and compact design and a wide tuning range.…”

Section: Introductionmentioning

confidence: 99%

“…In most of the applications, tuning of frequency is required [2], [4]- [10]. The tuning of frequency can be done by connecting different capacitive loads at the output node [6] or by varying supply current [2], [4], [5], [7]- [9]. The large area of capacitors is one of the drawbacks of the capacitive loadbased frequency tuning technique.…”

Section: Introductionmentioning

confidence: 99%

A Differential Delay Cell for Ring Oscillators

Singh¹,

SINGH²,

Sakare³

2023

Preprint

0

View full text Add to dashboard Cite

<p>This paper presents a differential delay cell (DDC) for a 3-stage current-starved ring voltage-controlled oscillator (CSRVCO). In the proposed delay cell, pass transistors and a pair of back-to-back transistors are connected in a symmetric structure that helps get less jittery output by providing similar charging and discharging paths from the load capacitor. The current flows from similar paths with the same type and number of transistors in the proposed DDC-based CSRVCO. For verifying the DDC operation, the 3-stage CSRVCO using the proposed DDC is implemented with a standard 65nm CMOS technology with 1V supply. Post-layout simulation results confirm the correct operation of the proposed DDC using the CSRVCO with minimal jitter at the output. The proposed CSRVCO can be tuned from 0.88 GHz to 2.76 GHz. The phase noise of -94.54 dBc Hz was measured at 1MHz offset frequency for the center frequency of 2.76 GHz. The CSRVCO was designed using the proposed DDC occupied area 1198.43 μm2, and dissipated power is 5.19mW.</p>

show abstract

An Automated Design Methodology for Ring Voltage-Controlled Oscillators in Nanometer CMOS Technologies

Lee

¹

,

Park

²

,

Han

³

et al. 2023

IEEE Access

1

0

View full text Add to dashboard Cite

This paper presents a design automation methodology for ring voltage-controlled oscillators (RVCOs) with their realistic and physical characteristics captured. With multiple sets of input constraints such as target frequency, phase noise, and control voltage range, the proposed algorithm automatically finds the design candidates that satisfy the target constraints, by running iterative post-layout simulations with auto-generated layouts and testbenches. The number of post-layout simulations is significantly reduced by the backtracking algorithm that observes the simulation results and determines the search direction. The proposed algorithm is applied to generate RVCOs in 40-nm planar and 7-nm FinFET technologies for DDR5 applications, and it turns out the proposed methodology produces sets of design parameters that meet the target specification in multiple technologies.

show abstract

A 600-μm² Ring-VCO-Based Hybrid PLL Using a 30-μW Charge-Sharing Integrator in 28-nm CMOS

Cited by 8 publications

References 13 publications

A Differential Delay Cell for Ring Oscillators

A Differential Delay Cell for Ring Oscillators

A Differential Delay Cell for Ring Oscillators

An Automated Design Methodology for Ring Voltage-Controlled Oscillators in Nanometer CMOS Technologies

Contact Info

Product

Resources

About