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相关概念视频

Power Factor Correction01:20

Power Factor Correction

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The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
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Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

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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....
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Design Example01:23

Design Example

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Basic Discrete Time Signals01:16

Basic Discrete Time Signals

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The unit step sequence is defined as 1 for zero and positive values of the integer n. This sequence can be graphically displayed using a set of eight sample points, showing a step function starting from n=0 and remaining constant thereafter.
The unit impulse or sample sequence is mathematically expressed as zero for all n values except at n=0, where it is one. The unit impulse sequence, denoted by δ(n), is the first difference of the unit step sequence, while the unit step sequence u(n) is...
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Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

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Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
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相关实验视频

Updated: Jun 14, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Published on: March 20, 2017

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一个基于ADPLL的GFSK调制器,为物联网应用程序提供双点调制.

Nam-Seog Kim1

  • 1Department of Information and Communication Engineering, School of Electrical and Computer Engineering, Chungbuk National University, Cheongju-si 28644, Republic of Korea.

Sensors (Basel, Switzerland)
|August 29, 2024
PubMed
概括

本研究介绍了一种基于全数字相锁循环 (ADPLL) 的高斯频率转换 (GFSK) 调制器,用于提高无线传感器网络 (WSN) 中的蓝牙低能耗 (BLE) 效率. 新的设计实现了高性能与低功耗.

关键词:
蓝牙低能耗 (BLE) 是指蓝牙的低能耗.斯频率转移键 (GFSK) 是一种频率转移键.物联网 (IoT) 的物联网 (IoT) 的物联网.全数字相锁循环 (ADPLL) 是一种全数字相锁循环.数字控制的振荡器 (DCO)频率转换密钥 (FSK) 错误的错误频率调范围的频率调范围.最小平均平方 (LMS) 算法低脱落调节器 (LDO) 是一个低脱落调节器.阶段噪声 阶段噪声过程,电压和温度 (PVT) 的变化.稳定调制指数 (SMI) 是一个稳定调制指数.时间到数字转换器 (TDC)两点调制 (TPM) 是一种无线传感器网络 (WSN) 是指无线传感器网络.

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相关实验视频

Last Updated: Jun 14, 2025

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09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

9.8K
Quasi-light Storage for Optical Data Packets
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科学领域:

  • 电气工程 电气工程
  • 计算机工程 计算机工程
  • 无线通信无线通信

背景情况:

  • 无线传感器网络 (WSN) 和物联网 (IoT) 设备需要像蓝牙低能耗 (BLE) 等节能通信.
  • 现有的BLE调制器在无处不在的WSN应用中面临效率和性能方面的挑战.
  • 2.4GHz频段对于短距离物联网设备通信至关重要.

研究的目的:

  • 介绍一款基于全数字相锁循环 (ADPLL) 的全集成高斯频率转换 (GFSK) 调制器.
  • 提高WSN和物联网设备BLE通信的效率和性能.
  • 为了满足BLE 5.0稳定调制指数 (SMI) 的要求.

主要方法:

  • 整合了两点调制 (TPM) 技术.
  • 设计一个具有快速沉降时间,自适应性LDO和ADC辅助插值的时间数字转换器 (TDC).
  • 开发一个数字控制的振荡器 (DCO) 配有delta-sigma调制器值,分层电容银行和LMS算法进行校准.

主要成果:

  • 在28纳米CMOS工艺中实现,活性面积为0.33mm2.
  • 证明了广的频率调范围 (2.212.58 GHz) 和低的带内相位噪声 (-102.1 dBc/Hz).
  • 实现了低FSK误差1.42%,功耗为1.6mW.

结论:

  • 开发的基于ADPL的GFSK调制器为节能BLE通信提供了显著的进步.
  • 设计特征有助于改进线性,时间分辨率和频率调范围.
  • 这种调制器非常适合无处不在和节能的WSN和物联网应用.