A5103284766- Radio Frequency Integrated Circuit Design
- Advanced Electrical Measurement Techniques
- Sensor Technology and Measurement Systems
- Advancements in PLL and VCO Technologies
- Microwave Engineering and Waveguides
- Scientific Measurement and Uncertainty Evaluation
- Analog and Mixed-Signal Circuit Design
- Advancements in Semiconductor Devices and Circuit Design
- Acoustic Wave Resonator Technologies
- Electromagnetic Compatibility and Noise Suppression
- Semiconductor materials and devices
- Advanced Power Amplifier Design
- Analytical Chemistry and Sensors
- Non-Destructive Testing Techniques
- Photonic and Optical Devices
- Power Quality and Harmonics
- Ultrasonics and Acoustic Wave Propagation
- Structural Health Monitoring Techniques
- Glycosylation and Glycoproteins Research
- Silicon Carbide Semiconductor Technologies
- Advanced Measurement and Metrology Techniques
- Mechanical and Optical Resonators
- Cryptographic Implementations and Security
- Quantum and electron transport phenomena
- Ultra-Wideband Communications Technology
Peking University
2005-2025
National Institute of Metrology
2013-2024
Allwinner Technology (China)
2023
University of Science and Technology of China
2006-2018
National Research Council Canada
2014
Beijing Institute of Technology
2013
Beijing University of Technology
2008-2012
Beijing Jiaotong University
2009-2012
Southwest Petroleum University
2011-2012
University of Tulsa
2012
Current cancer treatments face significant challenges, including limited tumor specificity and drug resistance. Enzyme‐instructed supramolecular peptide assembly targeting lysosomes offers a promising strategy to address these issues; however, self‐assembling units that withstand lysosomal conditions are still scarce. In this study, we present versatile glycopeptide incorporating glucuronic acid glucose undergoes glucuronidase‐triggered self‐assembly form nanofibers, leading membrane...
Brain accumulation of amyloid-β (Aβ) peptides (resulting from a disrupted balance between biosynthesis and clearance) occurs during the progression Alzheimer's disease (AD). Aβ have diverse posttranslational modifications (PTMs) that variously modulate aggregation into fibrils, but understanding mechanistic roles PTMs in these processes remains challenge. Here, we chemically synthesized three homogeneously modified isoforms (1-42) bearing Tyr10 O-glycosylation, an unusual PTM initially...
Current cancer treatments face significant challenges, including limited tumor specificity and drug resistance. Enzyme‐instructed supramolecular peptide assembly targeting lysosomes offers a promising strategy to address these issues; however, self‐assembling units that withstand lysosomal conditions are still scarce. In this study, we present versatile glycopeptide incorporating glucuronic acid glucose undergoes glucuronidase‐triggered self‐assembly form nanofibers, leading membrane...
An improved inductor layout with non-uniform metal width and spacing is proposed to increase the quality factor (Q factor). For this layout, from outer coil inner coil, reduced by an arithmetic-progression step, while increased a geometric-progression step. variable changed of benefit Q RF spiral improvement (approximately 42.86%), mainly due suppression eddy-current loss weakening current crowding effect in center inductor. In order further, for novel inductor, patterned ground shield used...
A low-power wideband common-gate (CG) low-noise amplifier (LNA) presented . The CG LNA uses double g m enhancement to provide input matching under consumption. Feed-forward noise cancellation (FFNC) is employed in the suppress from transistor. designed and fabricated TSMC 130-nm CMOS technology. This can achieve a maximum gain of 14 dB with 3 bandwidth 350 950 MHz. consumes 0.5 mA current 0.8-V supply. average figure 4.0 dB. core area 0.06 mm2.
A new type of calculable capacitor was initially built at the National Institute Metrology, China, in cooperation with Measurement Institute, Australia. The realized SI unit capacitance 1 pF, an uncertainty 20 parts <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$10^{9}$ </tex-math></inline-formula> . simplified operational approach used that avoids complex substitution measuring process small-value...
In a cross-capacitor with guard electrodes, the equivalent electrical length is sensitive to any variation in cross section of main electrodes unless measures are taken compensate for this. The problem arises particularly case movable electrode, which conventionally fitted nosepiece such geometry as variations from one position another. new National Institute Metrology cross-capacitor, an alternative approach, fraction measuring voltage applied isolated electrode face has been investigated....
Diamond has the highest thermal conductivity of any natural material. It can be used to integrate with GaN dissipate heat from AlGaN/GaN high electron mobility transistor (HEMT) channels. Much past work investigated properties GaN-on-diamond devices, especially boundary resistance between diamond and (TBReff,Dia/GaN). However, effect SiNx interlayer structure on devices is less investigated. In this work, we explore role different interfaces in contributing layers, specifically using 100 nm...
A low power and phase noise LC-tank VCO with linear gain for 2.4 GHz ISM band is presented. Self-switched biasing technology adopted to reduce flicker noise. Low consumption achieved by reducing supply voltage the character of this structure. To extend range (Kvco) in condition, distributed varactor used. The proposed implemented 0.18μm CMOS process. measured −122.9 dBc/Hz at 1MHz offset from 2.5 oscillation frequency, while consuming 2.6 mA current 1.2 V voltage, FOM 186 dBc/Hz.
A 0.65mW 2.4GHz low power phase noise LC-VCO for IEEE 802.15.4 application is implemented in 0.18μm CMOS technology. With the use of adaptive body biasing technique, supply voltage could be as 0.45V, consuming only 1.1mA current by VCO core.
This paper demonstrates a 76-81 GHz down-conversion mixer applied in automotive radar, which is characterized with high linearity, low local oscillator (LO) drive level as well conversion gain (CG) using TSMC 65-nm CMOS general-purpose (GP) technology. In order to satisfy both linearity and isolation requirements for an radar operating short-middle-far, the proposed this study comprises of enhanced double-balanced Gilbert-cell core series peaking transmission line source degeneration...
To compensate the end effect error in a vertical calculable cross capacitor with fixed and movable guard electrode, two different methods, nosepiece modified active auxiliary are usually adopted at National Measurement Institutes across world. However, latter electrical approach can be more difficult when assembling mirrors resonant cavity of Fabry-Perot laser interferometer. This paper describes novel hollow electrode that satisfy optical requirements. The model test experimental results...
The fundamental of digital-analog conversion (DAC) stepwise-approximated sine waves (SASW) is calculable based on the amplitude each step. Using direct comparison method in specific frequency, DAC SASW can be used as ac voltage reference. A normal commercial DAC-based system for using lock-in amplifier constructed to demonstrate practicability this method. quantization errors and influences rising times transients between adjacent steps affecting its wave are also studied evaluated. results...
A two terminal-pair coaxial AC bridge is constructed at NIM for high precision capacitance transfer, in which, an auto auxiliary source balance method proposed and achieved. The error introduced by circuit negligible level. can transfer from 1 pF to 100 with uncertainty of × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−8</sup> (k = 1) low audio frequency.
This paper presents an inductorless complementary-noise-canceling LNA (CNCLNA) for TV tuners. The CNCLNA exploits single-to-differential topology, which consists of a common gate stage and source stage. complementary topology can save power improve the noise figure. Linearity is also enhanced by employing multiple gated transistors technique. chip implemented in SMIC 0.18 μm CMOS technology. Measurement shows that proposed achieves 13.5–16 dB voltage gain from 50 to 860 MHz, figure below 4.5...
We present our continuing work on the displacement determination of guard electrode for new vertical calculable capacitor. describe a method determining by actively locking Fabry-Perot interferometer to stabilized laser at two cavity lengths interest. In order lock tightly, modulation width is optimized full-width half-maximum different lengths. For each lengths, maintained its resonance, and length quantized with space λ/2. Then, corresponding ratio between fixed standard capacitor...
The measurement methods of the step voltage risetime Partial Discharge calibrators are discussed. A method using a capacitor is recommended in latest edition IEC standard(IEC 60270-2015). However, influences by capacitance cables and capacitive component input impedance oscilloscope should not be neglected former method, especially for low-quantity discharge. rise time connecting resistor to PD presented. This more suitable charge transfers less than hundreds picocoulombs.
An ring-oscillator based, area efficiency self-biased clock generator phase-locked loop (PLL) design is presented. With the already existing dual-loop and summing amplifier in architecture, a capacitance multiplication method has been used to greatly save of PLL with nearly no other impact on total performance. Power supply rejection issue considered, zero-offset, glitch-free charge pump Fabricated 0.18-μm CMOS process, could operate from 50 600MHz, measured phase noise −102dBc@1MHz when...