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相关概念视频

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

808
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

612
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.
612
Clamper Circuit01:14

Clamper Circuit

324
A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
Within this circuit, the diode's orientation prompts the capacitor to charge up to the level of the most negative peak of the input signal. Upon reaching this state, the diode ceases to...
324
MOSFET Amplifiers01:17

MOSFET Amplifiers

128
The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
128
Clipper Circuit01:18

Clipper Circuit

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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
294

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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一个芯片集成的基于的微波振荡器.

Wei Sun1, Zhiyang Chen1, Linze Li2

  • 1International Quantum Academy, Shenzhen, 518048, China.

Light, science & applications
|April 29, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了第一个完全混合集成的基于微的微波振荡器,实现超低相位噪声,用于先进的通信和传感应用. 该芯片集成了激光器,微光器和光探测器,使其能够实现紧且高性能的微波生成.

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科学领域:

  • 光子学和集成电路技术
  • 微波工程 微波工程
  • 光学频率的光学频率.

背景情况:

  • 低噪音微波振荡器对于无线通信,雷达和计时系统至关重要.
  • 使用光学频率的光子微波合成器与电子振荡器相比,提供了优越的噪声性能和带宽.
  • 基于芯片的克尔频 (微) 正在成为微波发电的紧,低功耗替代品.

研究的目的:

  • 为了展示第一个完全混合集成的,基于微的微波振荡器在一个共同的基板上.
  • 在一个紧的设备中实现超低噪声性能和高频稳定性.
  • 探索微状态中的噪声灭动态,以提高微波信号质量.

主要方法:

  • 高功率DFB激光器,化微共振器 (Q > 25 × 10 ^ 6) 和高速光电探测器 (110 GHz带宽) 在单一芯片上的混合集成.
  • 使用定制的微电子电路为设备供电.
  • 利用非线性激光微共振器相互作用来观察和控制杀噪声的动态.

主要成果:

  • 展示了一种10.7GHz微波振荡器,其线宽为6.3MHz,相位噪声为-75/-105/-130dBc/Hz,其偏移为1/10/100kHz.
  • 实现了超低噪声激光 (6.9 Hz 线宽) 和在 76 mm^2 足迹范围内连贯的微生成.
  • 观察到噪声灭动态,抑制微波相位噪声>20dB,并提高微波功率高达10dB.

结论:

  • 开发的混合集成微振荡器代表了紧,高性能微波发电的重大进步.
  • 经过证明的压噪机制为减轻噪声和提高信号质量提供了一种全新的方法.
  • 这项技术有可能彻底改变通信,传感,成像和精度测量的应用.