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相关概念视频

Design Example: Vintage Mixing Console01:17

Design Example: Vintage Mixing Console

231
A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
231
Upsampling01:22

Upsampling

236
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
236
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

91
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
91
Cascaded Op Amps01:16

Cascaded Op Amps

633
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...
633
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

81
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
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Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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相关实验视频

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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一个改进的基于PSO的高线性优化升级转换混合器,用于雷达应用.

Tahesin Samira Delwar1, Unal Aras1, Abrar Siddique2

  • 1Department of Smart Robot Convergence and Application Engineering, Pukyong National University, Busan 48513, Republic of Korea.

Sensors (Basel, Switzerland)
|February 10, 2024
PubMed
概括

这项研究引入了改进的粒子群优化 (RPSO) 算法,以增强雷达升级转换混合器. RPSO算法通过克服传统方法的局限性来提高性能,从而产生高效和高线性雷达电路.

关键词:
增强的交叉四元导体变频器雷达 雷达 雷达 雷达 是一个改革的粒子小群优化优化.双重传导通道的路径.升级转换混合器的混合器

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科学领域:

  • 电气工程 电气工程
  • 信号处理 信号处理
  • 优化算法 优化算法

背景情况:

  • 雷达系统中传统的上转换混合器表现出高功耗,不良线性和不充分的转换增益.
  • 现有的优化算法,如传统的粒子群优化 (TPSO),存在局部最佳和过早的融合问题.

研究的目的:

  • 提出一个改进的粒子群优化 (RPSO) 算法,用于优化雷达应用中的升级转换混合器电路.
  • 提高混合器性能指标,包括线性,转换增益和功率效率.
  • 为了解决传统优化方法在电路设计中的局限性.

主要方法:

  • 开发了一种新的RPSO算法,结合了基于位置的速度融合 (VPC) 和波纹突变 (WM) 策略,以改善群体多样性并避免局部最佳.
  • 实现了使用双重传导路径 (TTP) 的新型电路配置,与差异常源 (DCS) 放大器和增强的交叉四极传导器 (ECQT) 进行了改进,以提高线性.
  • 通过基准函数验证和与遗传算法 (GA) 和非主导排序遗传算法II (NSGA-II) 的比较,验证了RPSO的有效性.

主要成果:

  • 该RPSO优化的混合器实现了2.5dB的测量转换增益 (CG).
  • 证明了高线性,其1dB压缩点 (OP1dB) 为4.2dBm.
  • 混合器的低噪声值 (NF) 约为3.1dB,功耗低3.24mW,使用RPSO的平均设计时间为4.535s.

结论:

  • 拟议的RPSO算法有效地优化了用于雷达应用的上转换混合器电路,克服了传统方法的局限性.
  • 新的电路配置和RPSO优化在转换增益,线性,噪声数字和功率效率方面取得了显著的改进.
  • 模拟和测量结果证实了RPSO优化的升级转换混合机的出色性能.