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Wide band low phase noise QVCO based on superharmonic injection locking

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Journal of Semiconductors 2016年第1期37卷 92-98页

作者：许亚兰江金光刘江华 GNSS Research Center Wuhan University Wuhan 430079 China School of Electronic and Communication Engineering Shenzhen Polytechnic Shenzhen 518055 China

A wide band, injection-coupled LC quadrature voltage control oscillator is presented. In the proposed circuit, two oscillators are injection locked by coupling their second-order harmonics in anti-phase, forcing the outputs of two oscillators into a quadrature phase state. As the common-mode point sampling the second har- monic frequency, flicker noise of the tail current is suppressed, the phase noise is reduced .The proposed design accomplishes a wide tuning frequency range by a combination of using a 5-bit switch capacitor array （SCA） for discrete tuning in addition to linearly varying AMOS varactors for continuous tuning. The proposed design has been fabricated and verified in a 0.18/zm TSMC CMOS technology process. The measurement indicates that the quadrature voltage controlled oscillator has a 41.7% tuning range from 3.53 to 5.39 GHz. The measured phase noise is 127.98 dBc/Hz at 1 MHz offset at a 1.8 V supply voltage with a power consumption of 12 mW at a carrier frequency of 4.85 GHz.

关键词： QVCO injection locking switch capacitor array （SCA） phase noise wideband

Detection of DC electric forces with zeptonewton sensitivity by single-ion phonon laser

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Science China(Physics,Mechanics & Astronomy) 2022年第11期65卷 107-114页

作者： Ya-Qi Wei Ying-Zheng Wang Zhi-Chao Liu Tai-Hao Cui Liang Chen Ji Li Shuang-Qin Dai Fei Zhou Mang Feng State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy of Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430071China University of the Chinese Academy of Sciences Beijing100049China Laboratory of Quantum Science and Engineering South China University of TechnologyGuangzhou510641China Research Center for Quantum Precision Measurement Guangzhou Institute of Industry TechnologyGuangzhou511458China School of Physics Zhengzhou UniversityZhengzhou450001China Department of Physics Zhejiang Normal UniversityJinhua321004China

Detecting extremely small forces helps exploring new physics quantitatively.Here we demonstrate that the phonon laser made of a single trapped ^(40)Ca^(+) ion behaves as an exquisite sensor for small force measurement.We report our successful detection of small electric forces regarding the DC trapping potential with sensitivity of(2.41±0.49)zN/√Hz,with the ion only under Doppler cooling,based on the injection-locking of the oscillation phase of the phonon laser in addition to the classical squeezing applied to suppress the measurement uncertainty.We anticipate that such a single-ion sensor would reach a much better force detection sensitivity in the future once the trapping system is further improved and the fluorescence collection efficiency is further enhanced.

关键词： single-ion sensor phonon laser super-sensitive detection injection locking classical squeezing

Modeling and experimental studies of a side band power re-injection locked magnetron

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Chinese Physics B 2016年第12期25卷 492-498页

作者：叶文军张益袁萍朱铧丞黄卡玛杨阳 College of Electronics and Information Engineering Sichuan University

A side band power re-injection locked （SBPRIL） magnetron is presented in this paper. A tuning stub is placed between the external injection locked （EIL） magnetron and the circulator. Side band power of the EIL magnetron is reflected back to the magnetron. The reflected side band power is reused and pulled back to the central frequency. A phase-locking model is developed from circuit theory to explain the process of reuse of side band power in SBPRIL magnetron. Theoretical analysis proves that the side band power is pulled back to the central frequency of the SBPRIL magnetron, then the amplitude of the RF voltage increases and the phase noise performance is improved. Particle-in-cell （PIC） simulation of a 10-vane continuous wave （CW） magnetron model is presented. Computer simulation predicts that the frequency spectrum＇s peak of the SBPRIL magnetron has an increase of 3.25 dB compared with the free running magnetron. The phase noise performance at the side band offset reduces 12.05 dB for the SBPRIL magnetron. Besides, the SBPRIL magnetron experiment is presented. Experimental results show that the spectrum peak rises by 14.29% for SBPRIL magnetron compared with the free running magnetron. The phase noise reduces more than 25 dB at 45-kHz offset compared with the free running magnetron.

关键词： magnetrons injection locking tuning stub phase noise

Design of a LC VCO and injection locked frequency divider special for Ka-band application 11th

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Design of a LC VCO and injection locked frequency divider sp...