A 0.3-V all digital crystal-less clock generator for energy harvester applications

Liu, Jen-Chieh; Lee, Wei Chun; Huang, Hong-Yi; Cheng, Kuo-Hsing; Huang, Chao-Jen; Liang, Yu-Wei; Peng, Jia-Hung; Chu, Yuan-Hua

doi:10.1109/ipec.2012.6522641

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…The low operating frequency have better FOM because the existence of large noise provided by frequency multipliers is not included in FOM. Although, the FOM of our proposed work are slightly higher than [11] and [21], the TC of our work is actually better than [11] and [21]. In other word, our proposed work is considerably competitive if the above papers are operated at around GHz.…”

Section: Output Power Spectrum and Phase Noisementioning

confidence: 70%

“…The output digital codes of the counter (C<6:0>) are dependent on the process variation. The mapping table is based on the process and temperature variations in the mapping table detection (MTD) [21]. Three process corners which are slowslow (SS), typical-typical (TT), and fast-fast (FF) with 5% V DD variation are considered.…”

Section: Architecture Of Proposed Clcgmentioning

confidence: 99%

“…The crystal-less clock generators in Table 1 are classified into two categories by their operating frequency. One aims to replace XOs and is operated around MHz, such as [11] and [21]. The other is a substitute for XOs and multipliers and is operated around GHz, such as [7] and [12].…”

Section: Output Power Spectrum and Phase Noisementioning

confidence: 99%

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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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Section: Output Power Spectrum and Phase Noisementioning

confidence: 70%

Section: Architecture Of Proposed Clcgmentioning

confidence: 99%

See 1 more Smart Citation

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

Ker²,

Zan³

2017

IEICE Trans. Electron.

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“…A digital controlled oscillator (DCO) with a low‐supply voltage can be used to address the concerns of both cost and speed [14, 15]. Furthermore, all‐digital CLCGs utilise no passive components or bandgap circuits, unlike analogue‐type CLCGs.…”

Section: Introductionmentioning

confidence: 99%

Low supply voltage and multiphase all‐digital crystal‐less clock generator

Liu

Cheng

et al. 2018

IET Circuits, Devices & Systems

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A multiphase all-digital crystal-less clock generator (CLCG) with an interpolating digital controlled oscillator (DCO) that achieves an operating frequency of 500 MHz with 10-phase outputs is proposed. The CLCG adopts a specific temperature coefficient of a time-to-digital convertor (TDC) to create a positive or negative temperature coefficient and compensates for the DCO frequency drift. A time amplifier (TA) can extend the timing resolution of the TDC and reduce the effects of process variations in order to tune the TA gains. The frequency compensator adopts the frequency difference between the ring oscillator and DCO to reduce the frequency drift. The frequency accuracy is 69 ppm/°C from − 20 to 80°C. The root mean square jitter and output phase noise are 3.86 ps and − 100.36 dBc/Hz at 1 MHz, respectively. The core area of the test chip is 350 × 420 μm 2 in a 65-nm CMOS process. At a supply voltage of 0.6 V, the power consumption is 1.8 mW for the 5 Gb/s clocking system.

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“…Relaxation oscillators repeatedly alternate between two states with a period that depend on the charging of a capacitor [6]- [10]. All digital CMOS-based oscillators are implemented for applications such as the internal control and the high-speed interface [11]- [13]. The low voltage, power and small area features of all digital CMOS-based oscillators bring enormous benefits.…”

Section: Introductionmentioning

confidence: 99%

A 8 Phases 192MHz Crystal-Less Clock Generator with PVT Calibration

Ker²,

Zan³

et al. 2017

IEICE Trans. Fundamentals

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A multi-phase crystal-less clock generator (MPCLCG) with a process-voltage-temperature (PVT) calibration circuit is proposed. It operates at 192 MHz with 8 phases outputs, and is implemented as a 0.18 µm CMOS process for digital power management systems. A temperature calibrated circuit is proposed to align operational frequency under process and supply voltage variations. It occupies an area of 65 µm × 75 µm and consumes 1.1 mW with the power supply of 1.8 V. Temperature coefficient (TC) is 69.5 ppm/ • C from 0 to 100 • C, and 2-point calibration is applied to calibrate PVT variation. The measured period jitter is a 4.58ps RMS jitter and a 34.55-ps peak-to-peak jitter (P2P jitter) at 192 MHz within 12.67k-hits. At 192 MHz, it shows a 1-MHz-offset phase noise of −102 dBc/Hz. Phase to phase errors and duty cycle errors are less than 5.5% and 4.3%, respectively.

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A 0.3-V all digital crystal-less clock generator for energy harvester applications

Cited by 7 publications

References 9 publications

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

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

Low supply voltage and multiphase all‐digital crystal‐less clock generator

A 8 Phases 192MHz Crystal-Less Clock Generator with PVT Calibration

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