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学术论文  基于H.264的无线传输差错控制及解码器的ARM实现

信息化社会的到来以及IP技术的兴起，正深刻的改变着电信网络的面貌以及未来技术发展的走向。无线通信技术的发展为实现数字化社区提供了有力的保证。而视频通信则成为多媒体业务的核心。如何在环境恶劣的无线环境中，实时传输高质量的视频面临着巨大的挑战，因此这也成为人们的研究热点。对于无线移动信道来说，网络的可用 ...

https://www.eeworm.com/dl/514/10744.html

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学术论文  软件无线电中数字下变频技术研究

软件无线电(SDR，Software Defined Radio)由于具备传统无线电技术无可比拟的优越性，已成为业界公认的现代无线电通信技术的发展方向。理想的软件无线电系统强调体系结构的开放性和可编程性，减少灵活性著的硬件电路，把数字化处理(ADC和DAC)尽可能靠近天线，通过软件的更新改变硬件的配置、结构和功能。目前，直接对射频(RF ...

https://www.eeworm.com/dl/514/13055.html

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模拟电子  MAX2691 L2 Band GPS Low-Noise Amplifier

&nbsp; The MAX2691 low-noise amplifier (LNA) is designed forGPS L2 applications. Designed in Maxim&rsquo;s advancedSiGe process, the device achieves high gain andlow noise figure while maximizing the input-referred 1dBcompression point and the 3rd-order intercept point. TheMAX2691 provides a hig ...

https://www.eeworm.com/dl/571/21346.html

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模拟电子  水声信号功率放大器的设计与实现

设计了水声信号发生系统中的功率放大电路，可将前级电路产生的方波信号转换为正弦信号，同时进行滤波、功率放大，使其满足换能器对输入信号的要求。该电路以单片机AT89C52，集成6阶巴特沃思低通滤波芯片MF6以及大功率运算放大器LM12为核心，通过标准RS232接口与PC进行通信，实现信号增益的程控调节，对干扰信号具有良好的抑 ...

https://www.eeworm.com/dl/571/21375.html

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模拟电子  相敏检波电路鉴相特性的仿真研究

分析了调幅信号和载波信号之间的相位差与调制信号的极性的对应关系,得出了相敏检波电路输出电压的极性与调制信号的极性有对应关系的结论。为了验证相敏检波电路的这一特性,给出3 个电路方案,分别选用理想元件和实际元件,采用Multisim 对其进行仿真实验,直观形象地演示了相敏检波电路的鉴相特性,是传统的实际操作实验所不可 ...

https://www.eeworm.com/dl/571/21390.html

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模拟电子  光电转换电路设计

OPTOELECTRONICS CIRCUIT COLLECTION AVALANCHE PHOTODIODE BIAS SUPPLY 1Provides an output voltage of 0V to +80V for reverse biasingan avalanche photodiode to control its gain. This circuit canalso be reconfigured to supply a 0V to –80V output.LINEAR TEC DRIVER–1This is a bridge-tied load (BTL) linea ...

https://www.eeworm.com/dl/571/21451.html

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模拟电子  射频集成电路设计John Rogers(Radio Freq

Radio Frequency Integrated Circuit Design I enjoyed reading this book for a number of reasons. One reason is that itaddresses high-speed analog design in the context of microwave issues. This isan advanced-level book, which should follow courses in basic circuits andtransmission lines. Most analog i ...

https://www.eeworm.com/dl/571/21466.html

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PCB相关  pci e PCB设计规范

This document provides practical, common guidelines for incorporating PCI Express interconnect layouts onto Printed Circuit Boards (PCB) ranging from 4-layer desktop baseboard designs to 10- layer or more server baseboard designs. Guidelines and constraints in this document are intended for use on b ...

https://www.eeworm.com/dl/501/22314.html

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电源技术  DN384 精确的电源排序,防止系统损坏

&nbsp; Many complex systems&mdash;such as telecom equipment,memory modules, optical systems, networking equipment,servers and base stations&mdash;use FPGAs and otherdigital ICs that require multiple voltage rails that muststart up and shut down in a specific order, otherwise theICs can be damage ...

https://www.eeworm.com/dl/505/24309.html

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电源技术  使用5V电源的高分辨率视频解决方案

&nbsp; Video cable driver amplifi er output stages traditionallyrequire a supply voltage of at least 6V in order to providethe required output swing. This requirement is usuallymet with 5V supplies by adding a boost regulator or asmall local negative rail, say via the popular LT&reg;1983-3.Such ...

https://www.eeworm.com/dl/505/24316.html

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