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相关概念视频

Generator Voltage Control01:21

Generator Voltage Control

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Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand,...
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Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
797
Integrator and Differentiator01:13

Integrator and Differentiator

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Op-amp circuits have significant applications in various fields, including automotive engineering. One such application is cruise control systems in cars, where op-amp circuits are integral for maintaining a constant speed. In these systems, op-amps function as both integrators and differentiators.
An integrator within an op-amp circuit produces an output directly proportional to the integral of the input signal. This is achieved by replacing the feedback resistor in a typical inverting...
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Applications of RC Circuits01:22

Applications of RC Circuits

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A relaxation oscillator is one of the applications of RC circuits. A neon lamp relaxation oscillator comprises a capacitor, a resistor, a voltage source, and a lamp. The lamp acts like an open circuit, with infinite resistance until the potential difference across the lamp reaches a specific voltage. At that voltage, the lamp acts like a short circuit with zero resistance, and the capacitor discharges through the lamp, thus producing light. Once the capacitor is fully discharged through the...
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Properties of DTFT I01:24

Properties of DTFT I

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In signal processing, Discrete-Time Fourier Transforms (DTFTs) play a critical role in analyzing discrete-time signals in the frequency domain. Various properties of the DTFTs such as linearity, time-shifting, frequency-shifting, time reversal, conjugation, and time scaling help understand and manipulate these signals for different applications.
The linearity property of DTFTs is fundamental. If two discrete-time signals are multiplied by constants a and b respectively, and then combined to...
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Basic Discrete Time Signals01:16

Basic Discrete Time Signals

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The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is...
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An ultra-high timing resolution pulse generator with spur suppression and correction of errors based on real-time computation.

The Review of scientific instruments·2023
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Multifunctional Setup for Studying Human Motor Control Using Transcranial Magnetic Stimulation, Electromyography, Motion Capture, and Virtual Reality
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一个基于数字到时间转换器的多功能任意定时发生器.

Dexuan Kong1, Zaiming Fu1, Hanglin Liu1

  • 1School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.

The Review of scientific instruments
|October 4, 2023
PubMed
概括

研究人员使用现场可编程门阵列和数字对模拟转换器 (DAC) 开发了一种新型的高分辨率数字对时间转换器. 这种架构实现了1ps的定时分辨率,使得灵活生成随机和可编辑的定时信号,以满足各种测试需求.

科学领域:

  • 电气工程 电气工程
  • 信号处理 信号处理
  • 仪器化 仪器化 仪器化

背景情况:

  • 精确的定时信号生成对于先进的电子系统和测试至关重要.
  • 现有的数字时间转换器通常面临着分辨率和灵活性方面的限制.
  • 现场可编程门阵列 (FPGA) 为定制信号生成提供可重新配置的硬件平台.

研究的目的:

  • 提出和验证一个新的高分辨率数字到时间转换器架构.
  • 通过利用数字对模拟转换器 (DAC) 的垂直分辨率来实现超高的定时分辨率.
  • 为了实现灵活生成任意分布的随机定时信号和可编辑的定时序列.

主要方法:

  • 开发了一种新的数字到时间转换器架构,集成FPGA和DAC.
  • 实现了实时时间振幅映射算法,将DAC垂直分辨率转换为时间分辨率.
  • 使用Xilinx XCKU040 FPGA和德克萨斯仪器DAC37J82进行实验验证.

主要成果:

  • 实现了 1 皮秒 (ps) 的计时分辨率.
  • 证明了从4.2纳秒 (ns) 到999秒 (s) 的广泛时间范围.
  • 成功实现了任意分布的随机定时信号,可编辑的序列 (1-128k长度),以及具有优异非线性信号爆发.

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结论:

  • 拟议的FPGA-DAC架构提供了超高的定时分辨率和灵活性.
  • 实时映射算法有效地将DAC分辨率转换为时间精度.
  • 这种多功能方法可以适应现有硬件,并满足各种测试要求.