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相关概念视频

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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.
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...
Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the system's...

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相关实验视频

Updated: Jun 24, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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高性能TM通极化器使用多模式布拉格格波导.

ZhengYing Xu, Bin Tu, Hao Liu

    Optics express
    |June 11, 2024
    PubMed
    概括
    此摘要是机器生成的。

    使用多模布拉格格网波导 (MBGW) 的新型超宽带偏振器提供高灭绝比和低反射. 这种设备对先进的光通信系统有很大的希望.

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    科学领域:

    • 光子学和光学工程的工程.
    • 集成光学 集成光学 集成光学

    背景情况:

    • 极化器是光学系统中的关键组件,可以控制光的极化.
    • 现有的极化器经常面临带宽,插入损失和极化灭绝比 (PER) 的限制.

    研究的目的:

    • 提出和演示一种新的超宽带TM通极化器.
    • 为了在广泛的运行带宽中实现高PER和低反射.

    主要方法:

    • 使用多模式布拉格格波导体 (MBGW) 结构与缩波导体相结合.
    • 优化 MBGW 期间,将 TE0 模式合到反向 TE2 模式,以防止外泄漏.
    • 连接多个MBGW结构以扩大运营带宽.

    主要成果:

    • 在300 nm带宽 (1400-1700 nm) 中,模拟插入损失 (IL) 低于0.24 dB,PER高于39 dB.
    • 模拟反射信号低于 -9.1 dB.
    • 实验结果显示IL低于0.56dB,PER高于33dB在160nm带宽 (1470-1630nm) 上.

    结论:

    • 拟议的基于MBGW的偏振器实现了卓越的性能指标,包括超宽带操作.
    • 该设备表现出高PER和低IL,使其适合要求高的光通信应用.
    • 建议对整个模拟带宽进行进一步的表征.