基于PXI总线的宽带频率计设计
摘 要:对基于PXI总线的宽带频率计进行了研究。针对宽带频率的特点,采用了预分频法和基于相位重合的全同步法对被测频率进行测量,达到较高的测频精度。在硬件电路设计中采用可编程逻辑器件FPGA对相位重合检测电路、闸门和计数器等模块进行设计,既使用方便,又易于修改,同时该频率计采用最新流行的PXI总线技术贯彻了虚拟仪器的思想,使本来需要硬件实现的技术软件化,大大降低了系统成本,增强了系统的功能与灵活性。
关键词:宽带频率计; FPGA; PXI总线; 分频器
中图分类号:TP274 文献标识码:A
文章编号:1004-373X(2010)11-0018-03
Design of Wide-range Frequency Meter Based on PXI Bus
HUANG Guan-zhong, LI Zhi-qiang
(Ordnance Engineering College, Shijiazhuang 050003, China)
Abstract: The broadband frequency meter based on PXI bus is researched. Aiming at the characteristics of the broadband frequency, the predividing-frequency method and full synchronization method based on phase coincidence are used to measure the frequency, which reaches a high precision. The FPGA is used in hardware circuit to design the phase coincidence detecting circuit, and the modules of the gate and counter, which is very convenient to operate and amend. This frequency meter uses the popular technology of PXI bus, which carries through the thought of virtual instrument, realizes the function by software instead of hardware, reduces the system cost greatly, and enhances the system function.
Keywords: broadband frequency meter; FPGA; PXI bus; frequency divider
频率信号具有抗干扰性强,易于传输,易于保持信息完整性和可以获得较高测量精度等优点,被广泛应用于日常生活、工业等各个领域,频率测量成为信息提取、设备检测等过程中的一个重要环节。频率检测作为电子测量领域最基本的测量之一,随着数字电子技术的发展而得到了长足的进步,数字频率测量也得到了越来越广泛的应用,从而使测频原理和测频方法的研究受到越来越多的关注。本文在简述频率测量原理和方法的基础上,主要介绍一种基于PXI总...
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