论文部分内容阅读
一、前言 电视工程师们早就梦想着研制一种用SAW滤波器取代普通的LC滤波器,而不需在安装线上调整的全固体电视图像中频电路。为什么这个梦想至今还未实现呢?有几种原因:SAW器件工艺不成熟,成本下降得不够;最主要的原因,是除了降低成本和节省劳力以外,电视机制造者看不到其它的优越性。 1977年曾报导:我们已经改进了批量生产SAW滤波器的设计方法和制作工艺,并且在市场上售用于分立元件中频电路的
I. INTRODUCTION Television engineers have long dreamed of developing an all-solid-state television intermediate frequency (IF) circuit that uses a SAW filter instead of an ordinary LC filter and does not require adjustment on the installation line. Why this dream has not yet achieved? There are several reasons: SAW device technology is not mature, the cost reduction is not enough; the main reason is that in addition to reducing costs and saving labor, TV manufacturers do not see other advantages . It has been reported in 1977 that we have improved the design method and manufacturing process for mass-produced SAW filters and are commercially available for use in the discrete components of IF circuits