电视机行场扫描电路的现状与发展趋势  

The Present Status and Developing Trend of TV Deflection Circuit

作　　者：于圣学[1] 杨其锋[1] 李明[1] 

机构地区：[1]河南机电高等专科学校电子工程系,河南新乡453002

出　　处：《河南机电高等专科学校学报》2006年第2期12-13,共2页Journal of Henan Mechanical and Electrical Engineering College

摘　　要：文章以LA7680为实例,结合该集成块的内外行场扫描电路,重点论述了石英晶体振荡器、数字分频器两步走的AFC电路。与传统的LC振荡器、一级AFC锁频电路相比,本电路频率稳定,相位准确,而电路结构和成本并未明显复杂与提高。This essay, taking LA7680 as an example, with its inner and external line-field sweep circuit ,puts stress on the discussions of quarts crystal, digital frequency divider and two-step AFC circuit, contrasting with traditional LC oscillation , first-class AFC tracking frequency circuit, this circuits, frequency is stable , its phase accurate, and the structure, the cost do not apparently become complex and high.

关 键 词：高Q值的石英晶振 数字式分频 频率牵引 相位比较 

分 类 号：TN850.4[电子电信—信息与通信工程]