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可编程逻辑 扩频通信芯片STEL-2000A的FPGA实现

针对传统集成电路(ASIC)功能固定、升级困难等缺点,利用FPGA实现了扩频通信芯片STEL-2000A的核心功能。使用ISE提供的DDS IP核实现NCO模块,在下变频模块调用了硬核乘法器并引入CIC滤波器进行低通滤波,给出了DQPSK解调的原理和实现方法,推导出一种简便的引入?仔/4固定相移的实现方法。采用模块化的设计方法使用VHDL语言 ...
https://www.eeworm.com/dl/kbcluoji/40234.html
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技术资料 一种基于单片机的胎心仪信号模拟装置

胎心率是胎儿健康状态的重要生理指标,超声测量胎心率是临床上最常用的一种手段。在超声胎心仪的研制过程中需要胎心仪信号模拟装置来验证仪器精确性,提出一种基于单片机的胎心仪信号模拟装置,该装置用步进电机驱动小钢珠在水中震动,模拟人体内的胎儿心脏的跳动,通过单片机内的定时器功能改变钢珠震动的频率和幅度,通过震动的 ...
https://www.eeworm.com/dl/897404.html
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技术资料 基于单片机的多功能电子时钟的设计

提出了一种基于单片机的多功能电子时钟的设计方法,以AT89C52单片机作为系统的主控芯片,采用DS1302作为时钟控制芯片,实现日期时钟显示并且提供精准定时的功能。此外,还可经由DHT22所构成的温湿度传感电路,将温湿度参数输入到单片机中进行处理,然后通过液晶显示电路将所有的结果显示出来。结果表明该电路能精确的显示时钟以及 ...
https://www.eeworm.com/dl/897434.html
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技术资料 基于IAP单片机的环境检测灭火小车

为提高火灾预防及扑灭的效率及安全性,设计了一款基于IAP单片机的环境检测灭火小车。小车具有手持控制系统和车载执行系统:手持控制系统由串口触摸屏完成指令输入和信息显示,由DS1302完成时间更新,由无线串口模块完成数据的发送与接收;车载执行系统由DHT11传感器完成温湿度检测,由MQ-2传感器完成可燃气体浓度检测,由YL-38传感 ...
https://www.eeworm.com/dl/897740.html
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技术资料 基于FPGA和单片机的高精度数字频率计的设计与实现

本文主要介绍了一种基于FPGA和单片机的高精度数字频率计的设计与实现。51单片机实现计算功能,液晶屏完成数据显示,FPGA对被测信号计数并将测量结果发送给单片机。实现了频率范围为1Hz~10MHz、有效电压范围为50mV~1V的正弦波信号频率和周期的测量;以及频率范围在100Hz~1MHz、峰峰值电压范围50mV~1V的两路同频周期方波信号的时 ...
https://www.eeworm.com/dl/898089.html
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电源技术 DN1011 简单高效率隔离型反激式电源

  While simplicity and high effi ciency (for cool running) areno longer optional features in isolated power supplies, itis traditionally diffi cult to achieve both. Achieving higheffi ciency often requires the use of advanced topologiesand home-brewed secondary synchronous rectifi cationsch ...
https://www.eeworm.com/dl/505/24301.html
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单片机编程 A Single-Chip Pulsoximeter Des

This application report discusses the design of non-invasive optical plethysmographyalso called as pulsoximeter using the MSP430FG437 Microcontroller (MCU). Thepulsoximeter consists of a peripheral probe combined with the MCU displaying theoxygen saturation and pulse rate on a LCD glass. The same se ...
https://www.eeworm.com/dl/502/30710.html
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嵌入式综合 PICMG_COM_0_R2_0COMe规范--原文资料

A Computer-On-Module, or COM, is a Module with all components necessary for a bootable host computer, packaged as a super component. A COM requires a Carrier Board to bring out I/O and to power up. COMs are used to build single board computer solutions and offer OEMs fast time-to-market with reduced ...
https://www.eeworm.com/dl/566/34689.html
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嵌入式综合 XAPP1023-测试Virtex-4 TEMAC系统的性能

This application note provides step-by-step instructions on how to recreate a Tri-Mode Ethernet(TEMAC) performance testing system using the ML405 board and MontaVista Linux 4.0. Thisapplication note shows how to set up a simple EDK Base System Builder system on the ML405Evaluation Platform and run ...
https://www.eeworm.com/dl/566/35815.html
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测试测量 高精度温度测量铂电阻温度探测器(PRTDs)和​​ADC

Abstract: Many modern industrial, medical, and commercial applications require temperature measurements in the extended temperature rangewith accuracies of ±0.3°C or better, performed with reasonable cost and often with low power consumption. This article explains how platinumresistance ...
https://www.eeworm.com/dl/544/41751.html
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