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找到约 196 项符合 phase-lockedmloop 的查询结果

单片机编程 基于ATmega48的3相无刷电机的控制方法

介绍了采用ATmega48单片机实现三相无刷直流电机控制器的方法。利用Atmega48获得带死区的脉宽调制(PWM)、霍尔传感器的换相处理、正弦驱动信号的产生和电机转速的控制等功能。采用该方法的优点是所需的外围器件少,成本低。 Abstract:  The method of 3-phase brushless DC motor control based on ATmega48 is pre ...
https://www.eeworm.com/dl/502/29241.html
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单片机编程 AD9859芯片资料

FEATURES400 MSPS internal clock speedIntegrated 10-bit DAC32-bit tuning wordPhase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)Excellent dynamic performance>75 dB SFDR @ 160 MHz (±100 kHz offset) AOUTSerial I/O control1.8 V power supplySoftware and hardware controlled power-down48-lead TQFP/EP ...
https://www.eeworm.com/dl/502/29887.html
下载: 131
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单片机编程 MCU(单片机)对可控硅的控制

MCU(单片机)对可控硅的控制:交流市电控制――MCU对可控硅的控制 郭江辛 07-23-03在用可控硅对交流市电控制中,主要注意以下几个方面:一, 同步信号 (弄不好都会产生不均匀的斩波,控制白炽灯表现为灯闪)1) 清楚同步信号在交流周期中的位置,最好在交流零点选取.在一些阻容降压对MCU 供电电路中,最好直接在交流电源两端 ...
https://www.eeworm.com/dl/502/31131.html
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教程资料 XAPP806 -决定DDR反馈时钟的最佳DCM相移

This application note describes how to build a system that can be used for determining theoptimal phase shift for a Double Data Rate (DDR) memory feedback clock. In this system, theDDR memory is controlled by a controller that attaches to either the OPB or PLB and is used inan embedded microproces ...
https://www.eeworm.com/dl/fpga/doc/32600.html
下载: 125
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教程资料 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/fpga/doc/32653.html
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教程资料 基于CPLD的QDPSK调制解调电路设计

为了在CDMA系统中更好地应用QDPSK数字调制方式,在分析四相相对移相(QDPSK)信号调制解调原理的基础上,设计了一种QDPSK调制解调电路,它包括串并转换、差分编码、四相载波产生和选相、相干解调、差分译码和并串转换电路。在MAX+PLUSⅡ软件平台上,进行了编译和波形仿真。综合后下载到复杂可编程逻辑器件EPM7128SLC84-15中 ...
https://www.eeworm.com/dl/fpga/doc/32656.html
下载: 44
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嵌入式综合 71M6541演示板用户手册

The Maxim Integrated 71M6541-DB REV 3.0 Demo Board is a demonstration board for evaluating the 71M6541 device for single-phase electronic energy metering applications in conjunction with the Remote Sensor Inter-face. It incorporates a 71M6541 integrated circuit, a 71M6601 Remote Interface IC, periph ...
https://www.eeworm.com/dl/566/35025.html
下载: 56
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无线通信 Heart-RateFitness Monitors Go Wireless

Abstract: This article explains the recent trend in heart-rate and fitness monitors to go wireless toeliminate cables to allow free movement, and allow convenient data collection without the need to plug intheir devices. It details a typical wireless system, using the MAX1472 crystal-referenced ph ...
https://www.eeworm.com/dl/510/36213.html
下载: 154
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可编程逻辑 XAPP806 -决定DDR反馈时钟的最佳DCM相移

This application note describes how to build a system that can be used for determining theoptimal phase shift for a Double Data Rate (DDR) memory feedback clock. In this system, theDDR memory is controlled by a controller that attaches to either the OPB or PLB and is used inan embedded microproces ...
https://www.eeworm.com/dl/kbcluoji/40078.html
下载: 52
查看: 1028

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
下载: 120
查看: 1064