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一种基于厚膜工艺的电路版图设计

2014-03-05蒲亚芳

现代电子技术 2014年4期

蒲亚芳

摘 要: 在电子线路版图设计中,通常采用印刷线路板技术。如果结合厚膜工艺技术,可以实现元器件数目繁多,电路连接复杂,且安装空间狭小的电路版图设计。通过对3种不同电路版图设计方案的理论分析,确定了惟一能满足要求的设计方案。基于外形尺寸的要求,综合考虑电路的性能和元件的封装形式,通过合理的电路分割和布局设计,验证了设计方案的合理性和可实现性。体现了厚膜工艺技术在电路版图设计中强大的优越性,使一个按常规的方法无法实现的电路版图设计问题迎刃而解。

关键词: 电路版图设计; 电路分割设计; 厚膜混合集成电路; 厚膜工艺

中图分类号: TN710?34 文献标识码: A 文章编号: 1004?373X(2014)04?0118?03

Circuit layout design based on thick?film process

PU Ya?fang

(Shaanxi HuaJing Microelectronics Co., Ltd, Xian 710065, China)

Abstract: The printed circuit board (PCB) technology is applied to circuit design generally. If it is combined with thick?film process, the circuit layout design, in which the complicated connection and many devices are mounted in its limited room, can be implemented. The outstanding advantages of the thick?film hybrid circuit were demonstrated by theoretical analysis of three defferent design schemes of circuit layout design. It is the unique one which can meet the requirement of the circuit design scheme. According to the boundary dimension requirement of the circuit, the circuit performance and device encapsulation mode were considered thoroughly, and the rationality and realizability of the design scheme were validated by reasonable circuit segmenting design and layout design. The outstanding superiority of thick?film process was reflected in the circuit layout design. The difficulty that the conventional methods for circuit layout design could not overcome was solved easily .

Keywords: circuit layout design; circuit segmenting design; thick?film hybrid circuit; thick?film process

0 引 言

随着电子技术的飞速发展,对电子设备、系统的组装密度的要求越来越高,对电路功能的集成度、可靠性等都提出了更高的要求。电子产品不断地小型化、轻量化、多功能化。除了集成电路芯片的集成度越来越高外,电路结构合理的版图设计在体积小型化方面也起着举足轻重的作用。

1 厚膜工艺技术简述

厚膜工艺技术是将导电带和电阻通过丝网漏印、烧结到陶瓷基板上的一种工艺技术[1]。

厚膜混合集成电路是在厚膜工艺技术的基础上,将电阻通过激光精调后,再将贴片元器件或裸芯片装配到陶瓷基板上的混合集成电路[2]。

厚膜混合集成电路基本工艺流程图见图1。

图1 厚膜工艺流程图

厚膜工艺与印制板工艺比较见表1。……

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