编码器倍频、鉴相电路在FPGA中的实现
上传时间: 2013-10-27
上传用户:royzhangsz
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 microprocessor application. This reference system also uses a DCM that isconfigured so that the phase of its output clock can be changed while the system is running anda GPIO core that controls that phase shift. The GPIO output is controlled by a softwareapplication that can be run on a PowerPC® 405 or Microblaze™ microprocessor.
上传时间: 2014-11-26
上传用户:erkuizhang
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语言编写出源程序,在Virtex-II Pro 开发板上成功实现了整个系统。测试结果表明该系统正确实现了STEL-2000A的核心功能。 Abstract: To overcome drawbacks of ASIC such as fixed functionality and upgrade difficulty, FPGA was used to realize the core functions of STEL-2000A. This paper used the DDS IP core provided by ISE to realize the NCO module, called hard core multiplier and implemented CIC filter in the down converter, described the principle and implementation detail of the demodulation of DQPSK, and derived a simple method to introduce a fixed phase shift of ?仔/4. The VHDL source code was designed by modularity method , and the complete system was successfully implemented on Virtex-II Pro development board. Test results indicate that this system successfully realize the core function of the STEL-2000A.
上传时间: 2013-11-19
上传用户:neu_liyan
文章详细介绍了一种以Xilinx 公司生产的CPLD 器件XC9536 为核心来产生电机绕组参考电流, 进而实现具有绕组电流补偿功能的两相混合式步进电动机10 细分和50 细分运行方式的方法。实践证明, 该方法可以有效地提高两相混合式步进电动机系统的运行效果。
上传时间: 2013-11-16
上传用户:trepb001
数字三相锁相环中含有大量乘法运算和三角函数运算,占用大量的硬件逻辑资源。为此,提出一种数字三相锁相环的优化实现方案,利用乘法模块复用和CORDIC算法实现三角函数运算,并用Verilog HDL硬件描述语言对优化前后的算法进行了编码实现。仿真和实验结果表明,优化后的数字三相锁相环大大节省了FPGA的资源,并能快速、准确地锁定相位,具有良好的性能。
上传时间: 2013-10-22
上传用户:emhx1990
介绍了应用VHDL技术设计嵌入式全数字锁相环路的方法。详细描述了其工作原理和设计思想,并用可编程逻辑器件FPGA加以实面。
上传时间: 2013-10-20
上传用户:yl8908
DSP 实现软件锁相环
上传时间: 2013-11-05
上传用户:cazjing
软件锁相环设计相关资料料
标签: 软件锁相环
上传时间: 2015-01-02
上传用户:x18010875091
四相六线步进电机正反转驱动程序
上传时间: 2013-10-31
上传用户:wangcehnglin
单相电机
上传时间: 2015-01-02
上传用户:dajin