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相关概念视频

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

2.5K
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
2.5K
Inverting and Non-inverting OpAmps01:20

Inverting and Non-inverting OpAmps

943
In an inverting amplifier, the input voltage is connected through a resistor to the inverting terminal. Meanwhile, the non-inverting terminal is grounded and a feedback resistor is established between the inverting and output terminal, as depicted in Figure 1.
943
Cascaded Op Amps01:16

Cascaded Op Amps

723
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
723
Operational Amplifiers01:17

Operational Amplifiers

1.2K
The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
1.2K
Damped Oscillations01:07

Damped Oscillations

6.0K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
6.0K
Protein Buffers in Blood Plasma and Cells01:20

Protein Buffers in Blood Plasma and Cells

1.7K
The human body utilizes protein buffer systems to maintain a stable pH. These systems capitalize on the dual role of amino acids, which can act as acids or bases by accepting or releasing hydrogen ions in response to pH changes. Protein buffer systems are particularly significant in the extracellular fluid (ECF) and intracellular fluid (ICF) of active cells, where structural and functional proteins provide substantial buffering capacity.
Certain amino acids can exist in a zwitterion state at a...
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相关实验视频

Updated: Sep 9, 2025

Fabrication and Testing of Microfluidic Optomechanical Oscillators
09:10

Fabrication and Testing of Microfluidic Optomechanical Oscillators

Published on: May 29, 2014

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带有缓冲器的 GaN HEMT 振荡器

Sheng-Lyang Jang1, Ching-Yen Huang1, Tzu Chin Yang1

  • 1Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan.

Micromachines
|August 28, 2025
PubMed
概括

这项研究探讨了三种高电子移动性化物晶体管 (GaN-HEMT) 振荡器,改进了可靠,高性能无线电频率电路的设计. 结果显示优化的结构提高了效率和相位噪声, 这对于先进的电子设备至关重要.

科学领域:

  • 材料科学与工程
  • 电气工程
  • 半导体设备物理

背景情况:

  • 高电子移动性化物晶体管 (GaN-HEMT) 提供优越的开关速度,高功率密度和效率,使其成为功率电子和射频 (RF) 应用的理想选择.
  • 然而,由于自加热和基板格子不匹配,GaN-HEMT设备面临可靠性挑战,需要先进的电路设计来实现长期稳定性.
  • 耗尽模式的GaN-HEMT对于射频应用特别重要,这推动了对强大的振荡器设计的需求.

研究的目的:

  • 研究和改进三种类型的带宽隙 (WBG) GaN-HEMT固定频振荡器的设计技术.
  • 评估这些GaN-HEMT振荡器的性能和可靠性,重点关注相位噪声,功效数字 (FOM) 和在各种条件下的操作稳定性.
  • 为设计高性能和可靠的基于GaN的射频电路提供见解.

主要方法:

  • 设计和模拟一个具有LC反网络的单端GaN-on-SiC HEMT振荡器.
  • 开发一个包含左转传输线路LC网络的平衡振荡器,用于产生差异信号.
  • 使用8形感应器实现交叉合的GaN HEMT电压控制振荡器 (VCO),以改善Q因子和噪声抑制.

主要成果:

  • 单端振荡器以2.4dBm的输出功率达到8.85GHz,在1MHz的偏移下达到124.8dBc/Hz的相位噪声,FOM为199.8dBc/Hz. 热载体应力测试表明,在低供应时运行核心,在高供应时运行缓冲器可以提高可靠性.
关键词:
在 GaN HEMT 功率振荡器缓冲器值得一提的是左手传输线阶段噪声可靠性

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相关实验视频

Last Updated: Sep 9, 2025

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

Published on: May 29, 2014

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Quasi-light Storage for Optical Data Packets
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Quasi-light Storage for Optical Data Packets

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Gradient Echo Quantum Memory in Warm Atomic Vapor

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  • 平衡振荡器在3.818GHz工作,在1MHz偏移时产生-131.73dBc/Hz的相位噪声,FOM为-188.4dBc/Hz,在高供应电压下观察到相位噪声降解.
  • 交叉合的VCO在6.397GHz时显示出FOM为 -190.09dBc/Hz,利用排水感应器来增强Q因子和8形感应器来抑制噪音.

    • 结论:

    • 研究的GaN-HEMT振荡器设计显示出高性能射频应用的巨大潜力.
    • 优化电路拓,包括使用特定的反网络和电感器设计,对于实现优越的相位噪声和FOM至关重要.
    • 该研究为增强基于GaN的振荡器的可靠性和性能提供了有价值的设计指南.