二阶带通滤波器.双二阶带通滤波器的传递函数为。formula_16formula_17相角：formula_18formula_19formula_14formula_10
双二阶带阻滤波器.双二阶带阻滤波器的传递函数为<refnname=rs>Rolf Schaumann,H.Xiao,M.E.van Valkenburg, p225</ref>formula_22其频率响应formula_23相角：formula_24formu