描述
一般去耦电容的容量选取原则:
100M以下轻载:0.1uF,重载或存在较大低频噪声的可加并1-10uF的电容,介质材料选择陶瓷或钽为宜;
100M-1000M:前述+100-1000pF(+10pF),括号内根据频率的高限选择是否需要,小电容的介质选择必须是高频陶瓷,早期则多用云母,
1G以上:前述+1-10pF,介质最好选择高Q微波陶瓷材料。
高频重载时必须用多个小电容并联切不可直接用大电容。
顺便一说,技术上去耦电容不是一般称的滤波电容,滤波电容指电源系统用的,去藕电容则是分布在器件附近或子电路处主要用于对付器件自身或外源性噪声的特殊滤波电容,故有特称——去耦电容,去耦指“去除(噪声)耦合”之意。。
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