摘要
提出了一种基于现场可编程门阵列(Field Programmable Gate Array,FPGA)的高精度视频图形阵列(Video Graphics Ar-ray,VGA)个性化显示函数信号发生器的整体设计方案。通过对传统信号发生器进行改进,再利用先进的直接数字式频率合成器(Direct Digital Synthesizer,DDS)波形发生理论,获得了较理想的信号输出。本设计充分发挥了FPGA大逻辑门容量、超高精准时钟的特点。在软件编程过程中扩展了VGA个性化显示、参数掉电存储等功能。硬件电路则主要采用超高精准度的DAC902U芯片和7阶的椭圆低通滤波器,以求达到最佳的模拟信号输出效果。
A total design scheme of high-precision Video Graphics Array （ VGA ）displaying function signal generator based on Field Programmable Gate Array（ FPGA ） is proposed. To improve the traditional signal generator and obtain a better signal output, the design makes use of the advanced Direct Dig- ital Synthesizer（ DDS）theory. The design takes full advantage of the large logic gate capacity and the super high-precision clock. In the aspect of soft- ware, the design has realized the functions of VGA personalized displaying and non-volatile of the parameters in need. For the best analog signal output effects, the hardware mainly uses the highly accurate DAC902U and 7th-order elliptic filter.
出处
《电视技术》
北大核心
2013年第7期111-113,共3页
Video Engineering
基金
山东省自然科学基金项目(ZR2009GM026)
