该文档详细介绍了一款FM发射机的制作方法，图文并茂，简单易成。按作者说法，若不焊错，一般功率都在600mW以上。
标签： 调频发射机
上传时间： 2013-04-24
上传用户：hullow
什么是PWM控制 Pulse Width Modulation -- 脉宽调制 /脉冲宽度调制
标签： PWM
上传时间： 2013-04-24
上传用户：时代将军
对讲4811DATASHEET,BK4811是一款半双工FM语音收发芯片，集成完整的射频和基带功能，附加一块简单的MCU就能够实现个人双向语音通信系统。内置模拟和数字信令、低速率数据通信以及语音加密，使得芯片适用于从玩具、个人通信到集群通信的各种应用
上传时间： 2013-06-05
上传用户：dongbaobao
用fpga实现的DA转换器，有说明和源码，VDHL文件。\\r\\nA PLD Based Delta-Sigma DAC\\r\\nDelta-Sigma modulation is the simple, yet powerful,\\r\\ntechnique responsible for the extraordinary\\r\\nperformance and low cost of today s audio CD\\r\\nplayers. The simplest Delta-Sigm
上传时间： 2013-08-22
上传用户：dudu1210004
任何雷達接收器所接收到的回波(echo)訊號，都會包含目標回波和背景雜波。雷達系統的縱向解析度和橫向解析度必須夠高，才能在充滿背景雜波的環境中偵測到目標。傳統上都會使用短週期脈衝波和寬頻FM 脈衝來達到上述目的。
上传时间： 2014-12-23
上传用户：zhqzal1014
该款立体声调制度监视仪/分析仪可以保证FM发射记优质工作和 FM 电台保持在最大的调制电平或对发射机的性能进行检测。根据全美和国际标准，该款监视仪特设频率合成的RF预选器，可按50KHZ档预选频率。精确 的 基带解调，PLL 立体声信道解码，线性相位滤波器，为监视调制度电平和性能的检测提供了全面的方便的测试。多路音频输入可供检测和外接失真仪。该款仪器外接天线时可与低电平 RF输入端连接，也可经传输线耦合到高电平 RF输入端。
上传时间： 2013-11-15
上传用户：skhlm
Abstract: A digital RF modulator, an integrated solution that satisfies stringent DOCSIS RF-performancerequirements, takes advantage of modern technologies like high-performance wideband digital-to-analogconversion and CMOS technology scaling. This application note describes the concept and advantages ofa digital quadrature amplitude modulation (QAM) modulator that uses the direct-RF architecture to enablea cable access platform (CCAP) system.
上传时间： 2013-10-20
上传用户：drink！
Abstract: A laser module designer can use a fixed resistor, mechanical pot, digital pot, or a digital-to-analogconverter (DAC) to control the laser driver's modulation and bias currents. The advantages of a programmablemethod (POT or DAC) are that the manufacturing process can be automated and digital control can be applied(e.g., to compensate for temperature). Using POTs can be a more simple approach than a DAC. There can be aslight cost advantage to using a POT, but this is usually not significant relative to other pieces of the design.Using a DAC can offer advantages, including improved linearity (translating to ease of software implementationand ability to hit the required accuracy), increased board density, a wider range of resolutions, a betteroptimization range, ease of use with a negative voltage laser driver, and unit-to-unit consistency
上传时间： 2013-11-13
上传用户：ca05991270
This paper presents a space vector modulation(SVM)-based switching strategy for a three-level neutral point clamped (NPC) converter that is adapted as a STATCOM.
上传时间： 2013-10-20
上传用户：zyt
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比拟的。关键词:相敏检波;鉴相特性;Multisim;电路仿真 Abstract : The corresponding relation between modulation signal polarity and difference phases of amplitudemodulated signal and the carrier signal ,the polarity of phase2sensitive detecting circuit output voltage and the polarity of modulation signal are correspondent . In order to verify this characteristic ,three elect ric circuit s plans are produced ,idea element s and actual element s are selected respectively. Using Multisim to carry on a simulation experiment ,and then demonst rating the phase detecting characteristic of the phase sensitive circuit vividly and directly. Which is t raditional practical experience cannot be com pared.Keywords :phase sensitive detection ;phase2detecting characteristic ;Multisim;circuit simulation
上传时间： 2013-11-23
上传用户：guanhuihong
