A System-on-Chip Crystal-Less Wireless Sub-GHz Transmitter

Greiner, Philipp; Grosinger, Jasmin; Schweighofer, Johannes; Steffan, Christoph; Wilfling, Sandra; Holweg, Gerald; Bösch, Wolfgang

doi:10.1109/tmtt.2017.2748130

Cited by 11 publications

(21 citation statements)

References 11 publications

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“…For 16 samples a measured worst-case inaccuracy of 2.5°C over -50 to 170°C is achieved. Using only 1T-trimming, the presented frequency reference achieves a frequency accuracy on par with the 2T-trimming (at 0°C and 70°C) work presented in [3], but over the much wider temperature range of -50 to 170°C. Figure 2 shows the schematic of the Colpitts oscillator.…”

Section: Introductionmentioning

confidence: 84%

“…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. The best performing 1T-trimmed frequency reference is the Thermal-Diffusivity based reference [6] that uses the well-defined thermal diffusivity of silicon.…”

Section: Introductionmentioning

confidence: 99%

“…where Q is the quality factor of the LC-tank. The LC-based frequency references in [1], [3], [5] use the conventional cross-coupled LC-oscillator topology, where the oscillation frequency f depends significantly on Q [1]. In the low GHzrange (i.e., where Q L Q C ), TC f is dominated by the process and temperature dependent quality factor of the inductor (Q L ) [1].…”

Section: Introductionmentioning

confidence: 99%

“…Following our design philosophy, our oscillator itself is nontrimmable to exclude lossy and PVT-sensitive tuning/switching components, thereby minimizing the process spread of TC f to enable 1T-trimming with sufficient accuracy. Similar to the work in [3], [7], nominal frequency trimming and temperature compensation are accomplished by adjusting the division ratio (D) of a fractional divider as illustrated in Figure 1. The focus of our demonstration vehicle is on the generation of f osc itself.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Philipp Greiner et al presented a new approach for a wireless transmitter [18]. The PLL is designed for generating higher frequencies.…”

Section: Adpll For Wireless and Wireless Sensor Applicationsmentioning

confidence: 99%

An analysis of ADPLL applications in various fields

Rai¹,

Marimuthu²

2020

IJEECS

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<span>ADPLL is now an essential component in applications like wireless sensor networks, Internet of things, health care applications, agricultural applications, etc, and also due the requirement of digital implementation by the industries. ADPLL consists of a phase detector, loop filter and digital controlled oscillator. The conventional PLL and digital PLL used for frequency synthesis, clock recovery circuit and synchronization give imprecise performance with respect to reliability, speed, power consumption, noise, locking speed, cost, etc. ADPLL overcomes the drawbacks of conventional PLL and digital PLL. In this paper, different approaches followed in All Digital Phase Locked Loop (ADPLL) for various applications are reviewed and their performance is compared based on components, modulation functions, frequency range, power utilization etc. In addition, an ADPLL with wide tuning range and frequency resolution is designed and implemented using automatic placement and routing, time to digital converter, digital loop filter and ring based oscillator. The ADPLL outputs and the results are analyzed with micro wind tool. The design gives a frequency range from 1.0-5.5GHz with low power consumption and it can also be used for Clock generation applications. </span>

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