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関連する概念動画

MOSFET Amplifiers01:17

MOSFET Amplifiers

156
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...
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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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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

335
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...
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Cut-off Frequency of BJT01:17

Cut-off Frequency of BJT

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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...
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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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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Updated: Jul 1, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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フォトニックチップベースの低騒音マイクロ波振動器

Igor Kudelin1,2, William Groman3,4, Qing-Xin Ji5

  • 1National Institute of Standards and Technology, Boulder, CO, USA. igor.kudelin@colorado.edu.

Nature
|March 6, 2024
PubMed
まとめ
この要約は機械生成です。

この研究は,低騒音のマイクロ波信号を生成するための新しい統合フォトニックシステムを実証しています. 新しいチップベースのアプローチは,先端のナビゲーションおよび通信システムに前例のないフェーズノイズ性能を提供します.

さらに関連する動画

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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関連する実験動画

Last Updated: Jul 1, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

17.0K
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

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科学分野:

  • 光学について
  • マイクロウェーブ工学
  • 統合光学

背景:

  • 現代技術は低相ノイズと 安定したマイクロ波信号を必要とします
  • 現在のマイクロ波フォトニクスシステムは,大量または光ファイバーを使用しており,小型化と電力効率を制限しています.

研究 の 目的:

  • 低騒音マイクロ波信号生成のためのコンパクトで効率的な統合光子システムを開発する.
  • 現在のマイクロ波光学システムの限界を克服するために

主な方法:

  • チップ上の2点光学周波数分割を利用した.
  • 狭い線幅のレーザーを ミニチュアのファブリー・ペロ洞穴に安定させました
  • 光学周波数分割のためのダークソリトン周波数を使用し,出力を光検出しました.

主要な成果:

  • 100Hzのオフセットで -96dBc/Hzのフェーズノイズを持つ20GHzのマイクロ波信号を生成し,10kHzのオフセットで -135dBc/Hzに低下します.
  • 統合フォトニックシステムの前例のないフェーズノイズ性能を達成しました.
  • 単一のチップ上のすべての光子コンポーネントの異質な統合を証明した.

結論:

  • 高精度なナビゲーション,通信,タイミングに 重要な進歩をもたらします
  • このチップスケールのソリューションは より小さく より効率的なマイクロ波信号生成の道を開きます
  • 結果は,精密タイミングアプリケーションに革命をもたらすための統合フォトニクスの可能性を強調しています.