摘要
分析了双二阶开关电容滤波器(SCF)特征角频率ω_0和品质因数Q的灵敏度,以高Q带通滤波器为例,计算了SC支路按不同方向转移的三种不同电路以及单位电容改变时的S_x~ω_0和S_x^Q,并给出了计算机仿真结果。结果表明,ω_0和Q的灵敏度可精确地用各支路电容解析表达,其值只取决于各支路电容比而与电容值无关,当支路增益转移时,其灵敏度相应转置。
The purpose of this paper is to analyze the sensitivity of characteristic frequency and quality factor in switched capacitor filter(SCF). Taking the high Q bandpass filter for example, we change the SC branches in different ways and the normalized capacitance value,and caculate the Sxω0 and SxQ of the cicuit. The results of computor imitation are illustrated. It is found that the sensitivity for characteristic frequence ω0 and quality factor Q in biquadratic switched capacitor filter can be expressed exactly in the term of the analytic expression of the branch capacitance. The value of the Sxω0 and SxQ only depends on the capacitance ratio and has nothing to do with the value of the capacitor. The sensitivity is transposed according to the changing of branches.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
1991年第4期46-52,共7页
Journal of Chongqing University
关键词
滤波器
灵敏度
开关电容
filter
sensitivity/switched capacitor
