- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Berlin, Germany (2019.6.23-2019.6.27)] 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Analytical Model and Experiments of Phase Noise in Oven-Controlled Mems Resonators
摘要： We develop an analytical model of phase noise in an oven-controlled MEMS resonator, which behaves like 1/f. The model reveals that the 1/f like phase noise is up-converted of the self-heating noise of the spring constant. Though the self-heating voltage is white noise, the temperature fluctuation of the spring constant is 1/f like due to the thermal diffusion. When the supporting beam is infinite long, the power of the temperature fluctuation of the resonator are inversely proportional to f. The temperature fluctuation of the real resonator can be simulated by an equivalent circuit model. The temperature fluctuation is further modulated by the relaxation process of resonator damping. The power of the 1/f like phase noise in mechanical resonators is approximately proportional to Q2 when f approaches 0, Q being the quality factor of the resonator. The model matches the experiments qualitatively.
关键词： Oven-controlled MEMS resonator,1/f noise,phase noise
更新于2025-09-16 10:30:52
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Multipoint and energy-equal fiber-optic laser-ultrasonic actuator based on peanut-shaped structures
摘要： This paper introduces the parabolic variance (PVAR), a wavelet variance similar to the Allan variance (AVAR), based on the linear regression (LR) of phase data. The companion article arXiv:1506.05009 [physics.ins-det] details the Ω frequency counter, which implements the LR estimate. The PVAR combines the advantages of AVAR and modified AVAR (MVAR). PVAR is good for long-term analysis because the wavelet spans over 2τ, the same as the AVAR wavelet, and good for short-term analysis because the response to white and flicker PM is 1/τ3 and 1/τ2, the same as the MVAR. After setting the theoretical framework, we study the degrees of freedom and the confidence interval for the most common noise types. Then, we focus on the detection of a weak noise process at the transition—or corner—where a faster process rolls off. This new perspective raises the question of which variance detects the weak process with the shortest data record. Our simulations show that PVAR is a fortunate tradeoff. PVAR is superior to MVAR in all cases, exhibits the best ability to divide between fast noise phenomena (up to flicker FM), and is almost as good as AVAR for the detection of random walk and drift.
关键词： frequency stability,flicker,atomic frequency standard,Allan variance,phase noise,frequency noise,oscillator,measurement uncertainty
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Electrical and Computing Technologies and Applications (ICECTA) - Ras Al Khaimah, United Arab Emirates (2019.11.19-2019.11.21)] 2019 International Conference on Electrical and Computing Technologies and Applications (ICECTA) - Miniature Dual-Band Band-Pass Filter Using Slotted Ring Resonators and Coupled lines for L and S Bands Communication
摘要： This paper introduces the parabolic variance (PVAR), a wavelet variance similar to the Allan variance (AVAR), based on the linear regression (LR) of phase data. The companion article arXiv:1506.05009 [physics.ins-det] details the Ω frequency counter, which implements the LR estimate. The PVAR combines the advantages of AVAR and modified AVAR (MVAR). PVAR is good for long-term analysis because the wavelet spans over 2τ, the same as the AVAR wavelet, and good for short-term analysis because the response to white and flicker PM is 1/τ3 and 1/τ2, the same as the MVAR. After setting the theoretical framework, we study the degrees of freedom and the confidence interval for the most common noise types. Then, we focus on the detection of a weak noise process at the transition—or corner—where a faster process rolls off. This new perspective raises the question of which variance detects the weak process with the shortest data record. Our simulations show that PVAR is a fortunate tradeoff. PVAR is superior to MVAR in all cases, exhibits the best ability to divide between fast noise phenomena (up to flicker FM), and is almost as good as AVAR for the detection of random walk and drift.
关键词： atomic frequency standard,frequency noise,measurement uncertainty,oscillator,frequency stability,Allan variance,flicker,phase noise
更新于2025-09-16 10:30:52
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RF Frequency Synthesizer Based on Self-Mode-Locked Multimode Lasers
摘要： Low-noise local oscillators are very important in modern communication systems. To realize a stable solution with a limited size, symmetric multimode multi-section semiconductor laser pairs are reported in this paper for building a chip-level RF synthesizer. The symmetric laser structure utilizes a shared distributed Bragg reflector (DBR) and counterpropagating laser output with the help of an external feedback circuit to achieve self-mode-locking. The achieved phase noise performance is -92 dBc/Hz at a 10 kHz offset frequency for intermodal operation at 26.4 GHz using 5 locked modes, which is a 57 dB improvement compared to the free-running case. Moreover, an RF synthesizer covering frequencies of 11-13 GHz is realized based on the achieved mode-locked system using current tuning. The related phase noise of the laser pair beat-note output is -100 dBc/Hz at a 10 kHz offset of carrier frequencies of 11-13 GHz, which is 58 dB better than the phase noise of the beat-note output without mode-locking over 11-13 GHz.
关键词： timing jitters,EAM,PM,mode-locking,phase noise,SOA,self-mode-locked,DBR,frequency synthesizer,multimode semiconductor laser,intermodal oscillation
更新于2025-09-16 10:30:52
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Self-mode-locked multimode lasers for stabilised RF oscillators
摘要： Low phase noise RF oscillator in modern communication systems and opto-electronic oscillator techniques have achieved superior phase noise. Development and characterisation of coupled symmetric multimode multi-section semiconductor laser pairs are reported for building a chip level RF oscillator. The symmetric laser structure operation is adjusted to achieve a self-mode locking of five modes at 26.4 GHz inter-modal oscillation frequency with the phase noise performance of ?92 dBc/Hz at 10 kHz offset frequency.
关键词： self-mode locking,multimode lasers,RF oscillator,opto-electronic oscillator,phase noise
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Compensation of Laser Phase Noise Based on Polar-Coordinates Decision
摘要： In this work, we proposed and experimentally demonstrated a phase-noise-mitigation scheme based on polar coordinates decision in the 16-QAM coherent optical communication system. The BER curves are measured to verify the feasibility of the scheme.
关键词： Polar coordinate,Decision,Laser phase noise
更新于2025-09-16 10:30:52
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Octave-Band Microwave Frequency Synthesizer Using Mode-Locked Laser as a Reference
摘要： An octave-band voltage-controlled oscillator is phase-locked on the envelope of the pulse train from a mode-locked laser. The locking scheme employs a balanced Mach-Zehnder modulator with two photodiodes as a phase detector. The phase.locked loop has a loop bandwidth of approximately 1 MHz and an in-band phase noise of approximately -135 dBc/Hz at all frequencies. The integrated jitter from 1 kHz to 100 MHz is 21 fs, 18.3 fs and 13.8 fs at 5.016 GHz, 7.6 GHz and 10.032 GHz carrier frequencies, respectively. To the authors’ knowledge, this is the best jitter performance reported for a PLL with MZM-based phase detection and the ?rst reported PLL of this type featuring an octave-band frequency range.
关键词： Mode Locked Laser,Ultra low phase noise PLL,Low jitter PLL
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Electrical Engineering and Computer Science (ICECOS) - Batam Island, Indonesia (2019.10.2-2019.10.3)] 2019 International Conference on Electrical Engineering and Computer Science (ICECOS) - Modelling of Polymer Coated-based Optical Fiber Sensor for Moisture Measurement in Transformer Oil
摘要： The presence of phase noise (PN) severely deteriorates the sensitivity and range of frequency-modulated continuous wave radar systems. Thus, characterization and continuous monitoring of the PN is indispensable, and its estimation is often employed directly on chip. Although many contributions investigate methods for PN estimation, almost all of them consider a continuous-wave (CW) input signal. Differently, in this paper, we aim to estimate the PN from a linear frequency modulated continuous wave (FMCW) signal. For that, we propose two methods utilizing a so-called artificial on-chip target and further digital signal processing. These methods are evaluated in real-time and are the first-known solutions to determine PN estimates during the operation of an FMCW radar transceiver. We prove our methods with both simulation and measurement results from a hardware prototype. Further, we present techniques to efficiently realize the concepts in digital hardware. Finally, we compare and trade off the proposed methods against computational complexity and performance. The novel techniques may be applied to arbitrary input frequencies and bandwidths, and do not require a reference-clock input.
关键词： phase noise (PN),estimation,frequency-modulated continuous wave (FMCW),millimeter-wave radar,Delay lines,monolithic microwave integrated circuits
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Ottawa, ON, Canada (2019.7.8-2019.7.12)] 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Hybrid electromagnetic modelling of coherent radiation in electrically-pumped semiconductor lasers
摘要： A major drawback of frequency modulated continuous-wave (FMCW) radar systems is the permanent leakage from the transmit into the receive path. Besides leakage within the radar device itself, signal reflections from a fixed object in front of the antennas additionally introduce so-called short-range (SR) leakage. It causes a strong degradation of detection sensitivity due to the unavoidable phase noise of the transmit oscillator. In this work, we introduce an artificial on-chip target (OCT) to mitigate the SR leakage. The OCT consists of a delay line whose time delay is significantly smaller than the round-trip delay time of the SR leakage. This is motivated by the fact that in integrated circuits for automotive radar applications operating at 77 GHz delay lines in the range of only a few picoseconds can be realized with a reasonable amount of circuitry. Despite this constraint, we show that the proposed method achieves almost perfect cancelation of the SR leakage. The concept is based on the cross-correlation properties of the residual phase noise in the intermediate frequency (IF) domain. Further, the effectiveness of the proposed method is verified in an FMCW radar system simulation. It almost perfectly shows that a gain in sensitivity of approximately 6 dB is achieved, compensating for the performance degradation caused by the SR leakage. The novel leakage cancelation concept is carried out mainly in the digital domain enabling high flexibility and adaptivity.
关键词： Digital signal processing,frequency modulated continuous-wave (FMCW) radar,leakage cancelation,phase noise,reflected power canceler
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) - Tel-Aviv, Israel (2019.11.4-2019.11.6)] 2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) - Transformer-Coupled Octa-Core 60 GHz Push-Push VCO in a 45-nm RF-SOI CMOS Technology
摘要： This work presents a 60 GHz octa-core push-push VCO in a 45 nm partially depleted (PD) Silicon-on-Insulator (SOI) CMOS technology. We investigate the feasibility of coupling eight VCO cores via resonant-tank transformers and discuss circuit topology considerations. The measured phase noise at 63.4 GHz is (cid:2)95.3 dB/Hz at 1 MHz offset from carrier. The continuous frequency-tuning range is 19 %. The eight VCO cores consume in total 80 mW DC power. The complete circuit, including buffers at the fundamental and second harmonic outputs, draws 158 mA from a single 1 V supply. The total area of the octa-core VCO excluding pads is 0.18 mm2.
关键词： silicon-on-insulator,wideband,millimeter-wave,VCO,CMOS technology,phase noise
更新于2025-09-16 10:30:52