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Now showing items 1 - 16 of 29

  • Ka-band wideband VCO with LC filtering technique in 65-nm CMOS

    Ding, Tianao   Fan, Xiangning   Zhao, Dixian  

    This Letter reports a 25.80-30.84 GHz wideband millimetre-wave VCO in 65-nm CMOS technology. A 4-bit binary-weighted capacitor bank is used to extend the tuning range. The PMOS current source, as well as the LC noise filtering network, are used to improve the phase-noise performance. Occupying a core area of 0.056 mm(2), the implemented VCO core consumes 4.1 mW at a 1 V supply. At 26 GHz, it achieves a phase noise of -102.8 dBc/Hz at 1 MHz offset.
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  • “Decision-critical” work: a conceptual framework

    Fan, Xiangning   Els, Charl   Corbet, Kenneth J.   Straube, Sebastian  

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  • Opioids and Sleep Apnea

    Fan, Xiangning   Straube, Sebastian  

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  • A Low-voltage Programmable Frequency Divider with Wide Input Frequency Range

    Liao, Yilong   Fan, Xiangning  

    A low-voltage programmable frequency divider with wide input frequency range is fabricated in standard 0.18 mu m TSMC RF CMOS technology and presented in this paper. Considering the frequency division ratio of dual-modulus prescaler is relatively smaller, a programmable divider with full custom design is used to increase the frequency division ratio and the maximum operating frequency. The frequency division ratio of the programmable frequency divider covers from 64 to 255. And the measured results show that the programmable divider works correctly when the input frequency varies from 0.5 GHz to 6.0 GHz, with 1V supply. Besides, the power consumption is 3.5 mA at the maximum frequency of 6.0 GHz.
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  • CMOS 1.98–5.58 GHz transformer-based VCO with current-reused topology

    Fan, Xiangning   Li, Bin   Wang, Zhigong  

    A fully integrated ultra-wideband voltage-controlled-oscillator (VCO) constructed in a current-reused configuration is proposed. An ultra-wide tuning range is achieved thanks to the adopted transformer-based resonator, which makes use of the transformer and the proper arrangement of capacitors, while the current-reused topology can dramatically save DC power consumption. The transformer layout has been properly designed to attain a die area comparable to a single inductor VCO. Fabricated in a 0.18 mum CMOS technology, the VCO provides a frequency tuning range as high as 95% from 1.98 to 5.58 GHz and exhibits a phase noise of -122.8 to -108.6 dBc/Hz at 1 MHz offset from the carrier across the entire frequency range. The VCO core consumes 5.6-7.2 mA of current from a 1.8 V supply and occupies approximately an area of 0.8 mm 2. Despite the ultra-wide tuning range, the proposed VCO has the outstanding figure-of-merit (FOM T) of -192 to -199 dBc/Hz.
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  • CMOS 1.98-5.58 GHz transformer-based VCO with current-reused topology

    Fan, Xiangning   Li, Bin   Wang, Zhigong  

    A fully integrated ultra-wideband voltage-controlled-oscillator (VCO) constructed in a current-reused configuration is proposed. An ultrawide tuning range is achieved thanks to the adopted transformer-based resonator, which makes use of the transformer and the proper arrangement of capacitors, while the current-reused topology can dramatically save DC power consumption. The transformer layout has been properly designed to attain a die area comparable to a single inductor VCO. Fabricated in a 0.18 mu m CMOS technology, the VCO provides a frequency tuning range as high as 95% from 1.98 to 5.58 GHz and exhibits a phase noise of -122.8 to -108.6 dBc/Hz at 1 MHz offset from the carrier across the entire frequency range. The VCO core consumes 5.6-7.2 mA of current from a 1.8 V supply and occupies approximately an area of 0.8 mm(2). Despite the ultrawide tuning range, the proposed VCO has the outstanding figure-of-merit (FOMT) of -192 to -199 dBc/Hz.
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  • A Programmable Frequency Divider with Wide Division Ratio and Input Frequency Range

    Liao, Yilong   Fan, Xiangning   Shi, Yongjian  

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  • A 38 Gb/s to 43 Gb/s Monolithic Optical Receiver in 65 nm CMOS Technology

    Chen, Yingmei   Wang, Zhigong   Fan, Xiangning   Wang, Hui   Li, Wei  

    A scaled 40 Gb/s optical receiver incorporating a transimpedance amplifier (TIA), a limiting amplifier (LA), a clock and data recovery (CDR), and a 1: 4 demultiplexer was proposed in 65 nm CMOS technology. The TIA employs a regulated cascode structure to achieve low input resistance and a stable dc operating point, whereas the LA adopts the third-order interleaving active feedback technique to obtain greater bandwidth and flatter frequency response. A 10 GHz LC-based voltage controlled oscillator with a ring structure that generates eight phases is presented. A quarter-rate phase detector in the CDR samples the 40 Gb/s input data, which are retimed and demultiplexed into four sets of 10 Gb/s output data. Experimental results show that the recovered clock exhibits a phase noise of -112.39 dBc/Hz@10 MHz from a carrier frequency of 10 GHz, in response to 2(31)-1 PRBS input. The retimed and demultiplexed data exhibit a peak-peak jitter of 4.46 ps and an RMS jitter of 1.18 ps. The core circuit of the receiver consumes 160 mW from a 1.2 V supply.
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  • Influence of LFSR Dither on the Periods of a MASH Digital Delta-Sigma Modulator

    Liao, Yilong   Fan, Xiangning   Hua, Zaijun  

    This brief shows that applying a linear feedback shift register (LFSR) dither to a digital delta-sigma modulator (DDSM) cannot always increase its fundamental period. For some DDSMs, the LFSR dither may reduce its period in some cases, instead of increasing it, which worsens the output spectrum. Hence, this brief calculates the dithered DDSM's period and analyzes the influence of LFSR dither on the period. Furthermore, for this kind of DDSM, this brief explains how to add the LFSR dither to increase the period for a full input range. Finally, the experiment is performed to confirm the analysis.
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  • A reconfigurable passive mixer for multimode multistandard receivers in 0.18 μm CMOS

    Fan, Xiangning   Tao, Jian   Bao, Kuan   Wang, Zhigong  

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  • Reporting on work-related low back pain: data sources, discrepancies and the art of discovering truths

    Fan, Xiangning   Straube, Sebastian  

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  • A fractional-N frequency divider for multi-standard wireless transceiver fabricated in 0.18 mu m CMOS process

    Wang, Jiafeng   Fan, Xiangning   Shi, Xiaoyang   Wang, Zhigong  

    With the rapid evolution of wireless communication technology, integrating various communication modes in a mobile terminal has become the popular trend. Because of this, multi-standard wireless technology is one of the hot spots in current research. This paper presents a wideband fractional-N frequency divider of the multi-standard wireless transceiver for many applications. High-speed divider-by-2 with traditional sourcecoupled-logic is designed for very wide band usage. Phase switching technique and a chain of divider-by-2/3 are applied to the programmable frequency divider with 0.5 step. The phase noise of the whole frequency synthesizer will be decreased by the narrower step of programmable frequency divider. Delta-Sigma modulator is achieved by an improved MASH 1-1-1 structure. This structure has excellent performance in many ways, such as noise, spur and input dynamic range. Fabricated in TSMC 0.18 mu m CMOS process, the fractional-N frequency divider occupies a chip area of 1130 x 510 mu m(2) and it can correctly divide within the frequency range of 0.8-9 GHz. With 1.8 V supply voltage, its division ratio ranges from 62.5 to 254 and the total current consumption is 29 mA.
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  • A 1?V 0.18?μm fully integrated integer-N frequency synthesizer for 2.4?GHz wireless sensor network applications

    Fan, Xiangning   Tang, Li   Wang, Yujie   Yu, Lu   Yuan, Liang   Yang, Zehua   Wang, Zhigong  

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  • Mathematical calculation of sequence length in LFSR-dithered MASH digital delta-sigma modulator with odd initial condition

    Liao, Yilong   Fan, Xiangning  

    Multi-stAge noise SHaping (MASH) digital delta-sigma modulator (DDSM) with linear feedback shift register (LFSR) dither and odd initial condition is analyzed mathematically to investigate its periodic behavior. We derive the nonlinear equation of the quantization error in each stage to determine the corresponding sequence length. And five useful lemmas are introduced to help cope with the complicated calculation caused by the pseudo-random dither signal.
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  • Back schools for the treatment of chronic low back pain:possibility of benefit but no convincing evidence after 47 years of research-systematic review and meta-analysis

    Straube, Sebastian   Harden, Markus   Schroeder, Heiko   Arendacka, Barbora   Fan, Xiangning   Moore, R. Andrew   Friede, Tim  

    Back schools are interventions that comprise exercise and education components. We aimed to systematically review the randomized controlled trial evidence on back schools for the treatment of chronic low back pain. By searching MEDLINE, Embase, and Cochrane Central as well as bibliographies, we identified 31 studies for inclusion in our systematic review and 5 of these for inclusion in meta-analyses. Meta-analyses for pain scores and functional outcomes revealed statistical superiority of back schools vs no intervention for some comparisons but not others. No meta-analysis was feasible for the comparison of back schools vs other active treatments. Adverse events were poorly reported so that no reliable conclusions regarding the safety of back schools can be drawn, although some limited reassurance in this regard may be derived from the fact that few adverse events and no serious adverse events were reported in the back school groups in the studies that did report on safety. Overall, the evidence base for the use of back schools to treat chronic low back pain is weak; in nearly a half-century since back schools were first trialled, no unequivocal evidence of benefit has emerged.
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  • What is the relationship between disease activity, severity and damage in a large Canadian systemic sclerosis cohort? Results from the Canadian Scleroderma Research Group (CSRG)

    Fan, Xiangning   Pope, Janet   Baron, Murray  

    We studied the relationships between physician-assessed damage, severity and activity in a large, multicentre systemic sclerosis (SSc, scleroderma) cohort. We hypothesized that there is a relationship between disease activity and severity and damage, but that severity would be more strongly related to damage. A total of 520 SSc patients (87% women, mean age 56 years, mean 8.6 years disease duration, 39% diffuse SSc) were studied. The correlations between physician's global assessments of damage, activity and severity were determined overall and in a subset of early, diffuse SSc (n = 74). The mean (SD) patient global health score was 3.6 (2.4) on a 0-10 scale. Physician-rated severity, activity and damage were 2.8 (2.2), 2.3 (2.0), and 3.4 (2.4) respectively. Damage was more strongly related to severity (r = 0.744, P < 0.001) than activity (r = 0.596, P < 0.001). Damage was not related to disease duration (r = 0.046, P = 0.3). In early diffuse SSc, the correlations were: damage and severity 0.771 (P < 0.001), damage and activity 0.596 (P < 0.001), severity and activity 0.809 (P < 0.001). The relationships vary in the overall cohort versus the early diffuse SSc subset where activity, severity and damage appear more strongly related. Thus, the exact nature of the relationship between damage, activity and severity will depend upon the characteristics of the population studied.
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