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相关概念视频

Active Filters01:25

Active Filters

773
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
773
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

158
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
158
Inverting and Non-inverting OpAmps01:20

Inverting and Non-inverting OpAmps

634
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.
634
Op Amp AC Circuits01:18

Op Amp AC Circuits

184
Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).
184
MOSFET Amplifiers01:17

MOSFET Amplifiers

146
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...
146
Passive Filters01:27

Passive Filters

512
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
512

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相关实验视频

Updated: Jun 6, 2025

The Fabrication and Operation of a Continuous Flow, Micro-Electroporation System with Permeabilization Detection
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用于锁定放大器的混合过器.

Jeffrey Lindemuth1, Emilio Codecido1, Noah Faust1

  • 1Lake Shore Cryotronics, 575 McCorkle Blvd., Westerville, Ohio 43082, USA.

The Review of scientific instruments
|December 2, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种用于锁定放大器的新型混合过器,它结合了无限冲动响应 (IIR) 和移动平均过器. 这种新设计改善了噪声降低,并减少了精确的交流信号测量的沉降时间.

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科学领域:

  • 电气工程 电气工程
  • 信号处理 信号处理
  • 仪器化 仪器化 仪器化

背景情况:

  • 锁定放大器需要在杂的环境中精确测量交流信号.
  • 传统的无限冲动响应 (IIR) 过器具有较长的沉降时间.
  • 移动平均线过器提供更快的沉降,但对于降低噪音来说,其频率响应不足于最佳.

研究的目的:

  • 开发一种混合过器,将IIR和移动平均线过器结合起来,以提高锁定放大器的降噪效果.
  • 改进用于精度测量的过器的等效噪声带宽 (ENBW) 和沉降时间.
  • 为新型混合过器架构提供理论分析和设计方法.

主要方法:

  • 设计了一个混合过架构,将一个短的IIR过器与一个更长的有限脉冲响应 (移动平均值) 过器集成在一起.
  • 进行了理论分析,以推导混合过器的步骤响应,沉降时间,频率响应和ENBW.
  • 实验验证包括对电阻的噪声测量和与理论预测的比较.

主要成果:

  • 混合过器设计提供了改进的降噪,由ENBW量化.
  • 设计方法允许将沉降时间与较低的ENBW相匹配,或保持更快沉降的ENBW.
  • 实验结果验证了混合过器性能理论预测.

结论:

  • 混合过架构为锁定放大器的降噪提供了显著的进步.
  • 这种方法提供了沉降时间和噪声等效带宽之间的灵活权衡.
  • 该研究提供了一个实用的设计框架,用于优化精密测量仪器中的过器性能.