- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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An all-digital phase-locked loop with a PGTA-based TDC and a 0.6-V DCO
摘要： An all-digitally phase-locked loop (ADPLL) with a pipeline time-to-digital converter (TDC) is proposed in this paper. The TDC employs a programmable-gain time ampli?er (PGTA) to achieve two-step time quantization. A compensator is used to correct the gain error of the PGTA. The low-voltage DCO uses current-reuse structure to achieve lower and use bridging-capacitance technique to achieve high frequency resolution. The proposed design is validated by the ADPLL fabricated in the 65-nm CMOS technology. The measurement results show that the in-band and out-band phase noises are ?90 dBc/Hz@10 kHz o?set and ?130 dBc/Hz@1 MHz o?set, respectively. The RMS and peak-peak jitter are 1.24 ps and 8.65 ps respectively.
关键词： all digitally phase-locked loop,programmable-gain time ampli?er,current-reuse,time-to-digital converter
更新于2025-09-11 14:15:04
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Reduction of the Phase Noise Level of Heterodynes of Modern Spectrum Analyzers Using Fundamental Frequency Images of Direct Digital Synthesizers
摘要： A hybrid frequency synthesizer is developed in which fundamental frequency images of a direct digital synthesizer are used to improve noise characteristics. It is shown that this synthesizer can generate a wide range of output frequencies with a small step size adjustment. Mathematical modeling of the noise characteristics of the synthesizer and comparison with the noise characteristics of heterodynes of modern spectrum analyzers are carried out.
关键词： spectrum analyzer,phase-locked loop,direct digital synthesizer,phase noise,heterodyne,hybrid frequency synthesizer
更新于2025-09-10 09:29:36
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[IEEE 2017 International Renewable and Sustainable Energy Conference (IRSEC) - Tangier (2017.12.4-2017.12.7)] 2017 International Renewable and Sustainable Energy Conference (IRSEC) - Simulation. Testing and Implementation of a Phase Locked Loop Used to Control a PV - Micro- Inverter
摘要： Phase, amplitude and frequency of the utility grid are critical parameters for the operation of the grid-connected power conditioning equipments. In such applications, an accurate and fast detection of the phase angle of the utility voltage is essential to insure a correct generation of the reference signals. This paper mainly focuses on the simulation, test and the implementation of a specific Phase Locked Loop “inverse Park transformation PLL” that is used to control a PV-Micro-Inverter. The improvement consists of better harmonics filtering. Experimental results validate the effectiveness of the proposed method.
关键词： PV-Micro-Inverter,Simulation,Test,Phase Locked Loop,Implementation
更新于2025-09-10 09:29:36
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Quantitative comparison of wideband low-latency phase-locked loop circuit designs for high-speed frequency modulation atomic force microscopy
摘要： A phase-locked loop (PLL) circuit is the central component of frequency modulation atomic force microscopy (FM-AFM). However, its response speed is often insufficient, and limits the FM-AFM imaging speed. To overcome this issue, we propose a PLL design that enables high-speed FM-AFM. We discuss the main problems with the conventional PLL design and their possible solutions. In the conventional design, a low-pass filter with relatively high latency is used in the phase feedback loop, leading to a slow response of the PLL. In the proposed design, a phase detector with a low-latency high-pass filter is located outside the phase feedback loop, while a subtraction-based phase comparator with negligible latency is located inside the loop. This design minimizes the latency within the phase feedback loop and significantly improves the PLL response speed. In addition, we implemented PLLs with the conventional and proposed designs in the same field programmable gate array chip and quantitatively compared their performances. The results demonstrate that the performance of the proposed PLL is superior to that of the conventional PLL: 165 kHz bandwidth and 3.2 μs latency in water. Using this setup, we performed FM-AFM imaging of calcite dissolution in water at 0.5 s/frame with true atomic resolution. The high-speed and high-resolution imaging capabilities of the proposed design will enable a wide range of studies to be conducted on various atomic-scale dynamic phenomena at solid–liquid interfaces.
关键词： frequency modulation atomic force microscopy,high-speed atomic-resolution imaging,phase-locked loop,calcite dissolution process
更新于2025-09-10 09:29:36
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[IEEE 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - Kannur,Kerala, India (2018.3.23-2018.3.24)] 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - Proportional Resonant Based Current Control Of Three-Phase Single Stage Grid Connected PV System
摘要： This paper presents an analysis of Proportional Integral (PI) controller based current control strategy and a Proportional Resonant (PR) controller based current control strategy for a three phase single stage grid connected PV system. PR controller has an advantage of tracking sinusoidal reference current without steady state error. It eliminates the number of coordinate transformation and reduces the complexity of control. It also reduces the current harmonics effectively and injects high quality power to the grid. The system is simulated using MATLAB and the results demonstrate that the PR based control strategy exhibits an excellent performance in tracking the reference current and in reducing the Total Harmonic Distortion (THD) in the current spectrum compared to the PI based control strategy.
关键词： PI controller,Grid connected PV system,PR controller,Phase Locked Loop (PLL)
更新于2025-09-04 15:30:14