Fully Integrated Frequency Reference With 1.7 ppm Temperature Accuracy Within 0–80°C

Ates, Erdogan Ozgur; Ergül, Atılım; Aksin, Devrim Yılmaz

doi:10.1109/jssc.2013.2280052

Cited by 17 publications

(18 citation statements)

References 18 publications

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“…Finally, two fourth-order polynomials are used to remove the average nonlinearity of the trimmed sp-poly and n-poly WBs. The coefficients for p 4 are the same for all samples and are extracted by characterizing a statistically significant set. All polynomials have fixed-point 24-bit internal operands and 18-bit output words, which ensures that the quantization errors originating from the polynomials are well below the expected accuracy of the frequency reference.…”

Section: B Digital Temperature Compensation and Loop Filtermentioning

confidence: 99%

“…By using different integrated time constants, various integrated frequency references have been developed, each with different tradeoffs between their accuracy and power consumption. LC oscillators use lithographically defined on-chip inductors and capacitors to achieve sub-100-ppm inaccuracy over the industrial temperature range [3], [4] but typically operate at GHz frequencies and thus dissipate at least a few milliwatts due to the limited quality factor of their on-chip inductors. References based on the well-defined thermal diffusivity of bulk silicon achieve inaccuracies of about 1000 ppm [5], [6] while those based on the thermal diffusivity of silicon dioxide can achieve about 300 ppm [7] over the military temperature range.…”

Section: Introductionmentioning

confidence: 99%

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A CMOS Dual-<italic>RC</italic> Frequency Reference With ±200-ppm Inaccuracy From −45 °C to 85 °C

Gürleyük

Pedala

Pan

et al. 2018

IEEE J. Solid-State Circuits

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This paper presents a 7-MHz CMOS RC frequency reference. It consists of a frequency-locked loop in which the output frequency of a digitally controlled oscillator (DCO) is locked to the combined phase shifts of two independent RC (Wien bridge) filters, each employing resistors with complementary temperature coefficients. The filters are driven by the DCO's output frequency and the resulting phase shifts are digitized by high-resolution phase-to-digital converters. Their outputs are then combined in the digital domain to realize a temperature-independent frequency error signal. This digitally assisted temperature compensation scheme achieves an inaccuracy of ±200 ppm from −45°C to 85°C after a two-point trim. The frequency reference draws 430 µA from a 1.8-V supply, while achieving a supply sensitivity of 0.18%/V and a 330-ppb Allan deviation floor in 3 s of measurement time. Index Terms-CMOS, digital frequency-locked loop (FLL), digitally controlled oscillator (DCO), integrated frequency reference, RC-based. , where he is currently pursuing the Ph.D. degree, with a focus on the design of energy-efficient CMOS temperature sensors. Fabio Sebastiano (S'09-M'10-SM'17) received the B.Sc. and M.Sc. degrees(cum laude) in electrical engineering from the University of Pisa, Pisa, Italy, in 2003 and 2005, respectively, the M.Sc. degree (cum laude) from the Sant'Anna School of Advanced Studies, Pisa, Italy, in 2006, and the Ph.D. degree from the

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Section: B Digital Temperature Compensation and Loop Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A CMOS Dual-<italic>RC</italic> Frequency Reference With ±200-ppm Inaccuracy From −45 °C to 85 °C

Gürleyük

Pedala

Pan

et al. 2018

IEEE J. Solid-State Circuits

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“…To our best knowledge, the best reported accuracy is obtained by a Colpitts LC-oscillator with ±1.7ppm over 80°C of operating range [2], but requires trimming at 16 temperatures per sample. The highest performing LC- [3] and RC-based [4] two-point temperature trimmed (2T) frequency references report an accuracy of ±50ppm over a temperature range of 105°C and ±200ppm over 130°C respectively.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the overall process spread of TC f is mainly determined by process variation of Q L , which therefore limits the achievable frequency accuracy over temperature after 1T-trimming. The work in [2] suggested that the TC f of a Colpitts oscillator is less sensitive to variation of Q L compared to that of the cross-coupled LC-oscillator. We derived mathematically that maximizing Q C in Colpitts oscillators reduces the dependency of TC f on Q L even further.…”

Section: Introductionmentioning

confidence: 99%

A Colpitts-Based Frequency Reference Achieving a Single-Trim ± 120ppm Accuracy from -50 to 170°C

Delke

Annema

Alink

et al. 2020

2020 IEEE Custom Integrated Circuits Conference (CICC)

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A single-trim, high accuracy frequency reference is presented. The Colpitts LC-oscillator topology reduces the temperature dependencies of the LC-tank quality factor on the oscillation frequency. With a fractional divider for frequency compensation it can serve as crystal-replacement. Measurements of the prototype (16 samples) in a 0.13µm high-voltage CMOS SOI process show ±120ppm accuracy from-50 to 170°C. The oscillator dissipates 3.5mW from a 2.5V supply and has 220ppm/V supply-sensitivity without supply regulation.

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“…Both above methods mostly combine proportional to absolute temperature (PTAT) circuit and the complementary to absolute temperature (CTAT) circuit to compensate temperature variations. Off chip calibrations compensate the variation by off-chip circuits or external control signals [8], [9]. On-chip compensation, also known as auto calibrations, integrate sensors and compensated circuits and could be all accomplished in the chip [10]- [13].…”

Section: Introductionmentioning

confidence: 99%

An Ultra-Low Voltage CMOS Voltage Controlled Oscillator with Process and Temperature Compensation

Ker²,

Zan³

2017

IEICE Trans. Electron.

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Process and temperature variations have become a serious concern for ultra-low voltage (ULV) technology. The clock generator is the essential component for the ULV very-large-scale integration (VLSI). MOSFETs that are operated in the sub-threshold region are widely applied for ULV technology. However, MOSFETs at subthreshold region have relatively high variations with process and temperature. In this paper, process and temperature variations on the clock generators have been studied. This paper presents an ultra-low voltage 2.4GHz CMOS voltage controlled oscillator with temperature and process compensation. A new all-digital auto compensated mechanism to reduce process and temperature variation without any laser trimming is proposed. With the compensated circuit, the VCO frequency-drift is 16.6 times the improvements of the uncompensated one as temperature changes. Furthermore, it also provides low jitter performance.

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Fully Integrated Frequency Reference With 1.7 ppm Temperature Accuracy Within 0–80°C

Cited by 17 publications

References 18 publications

A CMOS Dual-<italic>RC</italic> Frequency Reference With ±200-ppm Inaccuracy From −45 °C to 85 °C

A CMOS Dual-<italic>RC</italic> Frequency Reference With ±200-ppm Inaccuracy From −45 °C to 85 °C

A Colpitts-Based Frequency Reference Achieving a Single-Trim ± 120ppm Accuracy from -50 to 170°C

An Ultra-Low Voltage CMOS Voltage Controlled Oscillator with Process and Temperature Compensation

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