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相关概念视频

Voltage Dividers01:14

Voltage Dividers

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In electrical circuits, resistors can be connected in series, sequentially linked one after the other. In a series configuration, the same current flows through each resistor. Ohm's law is a fundamental principle to understand the behavior of resistors in series. It expresses the voltage across these resistors in terms of the current and resistance.
Kirchhoff's voltage law implies that the sum of the voltages across the resistors in series equals the source voltage. This means that the current...
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Cut-off Frequency of BJT01:17

Cut-off Frequency of BJT

1.4K
Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
1.4K
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

1.5K
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.
1.5K
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

433
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
433
Field Effect Transistor01:29

Field Effect Transistor

1.1K
Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
1.1K
Synthetic Disvision of Polynomials01:28

Synthetic Disvision of Polynomials

150
Synthetic division is an efficient algorithmic approach for dividing a polynomial by a linear binomial of the form x - c, where c is a real number. This method is helpful due to its streamlined process, which avoids the more cumbersome steps involved in the traditional long division of polynomials. It simplifies computation and serves as a practical tool for evaluating polynomials and identifying their factors.To perform synthetic division, one begins by listing the coefficients of the...
150

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相关实验视频

Updated: Jan 17, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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频率划分光电子振荡器用于高划分因子.

Chong Liu, Xinpeng Wang, Qizhuang Cen

    Optics express
    |September 23, 2025
    PubMed
    概括

    一种新型的频率划分光电子振荡器 (FD-OEO) 证明了有效的频率划分,具有很大的划分因子和低添加相位噪声,这对于先进的通信和雷达系统至关重要.

    科学领域:

    • 微波光子学 微波光子学
    • 光电学是指光电子产品.
    • 信号处理 信号处理

    背景情况:

    • 光电子振荡器 (OEO) 对于低相噪声信号生成至关重要.
    • 频率划分对于电信,雷达和光学频率跟踪至关重要.
    • 在频率划分系统中实现具有较低添加相位噪声的大分因子是一个持续的研究挑战.

    研究的目的:

    • 从理论和实验上证明一个有效的频率划分方案.
    • 通过使用新型的FD-OEO,实现具有较低添加相位噪声的大分因子.
    • 为实际应用验证拟议的FD-OEO的性能.

    主要方法:

    • 在一个空洞中产生了接近1 / n参考频率的振荡信号.
    • 振荡信号是使用马赫-泽恩德调制器 (MZM) 在非线性截面上乘以的.
    • 乘数信号与参考信号混合,向下转换的信号被反来锁定空洞,实现频率分割.

    主要成果:

    • 一个频率分割光电子振荡器 (FD-OEO) 已成功实施.
    • 该FD-OEO实现了9的除法因子,具有9GHz输入和1GHz输出.
    • 该系统在10kHz偏移时呈现出低附加相位噪声-155dBc/Hz,空洞延迟100ns.

    更多相关视频

    Fabrication and Testing of Microfluidic Optomechanical Oscillators
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    Fabrication and Testing of Microfluidic Optomechanical Oscillators

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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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    相关实验视频

    Last Updated: Jan 17, 2026

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    9.6K
    Fabrication and Testing of Microfluidic Optomechanical Oscillators
    09:10

    Fabrication and Testing of Microfluidic Optomechanical Oscillators

    Published on: May 29, 2014

    12.7K
    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
    09:23

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

    Published on: May 30, 2014

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    结论:

    • 拟议的FD-OEO是一种有效的频率划分方法,具有很大的划分因子和低附加相位噪声.
    • 这项技术在增强电信和雷达系统方面具有重大潜力.
    • 实验结果验证了理论框架,并证明了FD-OEO的实际可行性.