電容C的阻抗爲1/(jωC),所以電容上的分壓爲:
Av = [1/(jωC)]/[R+1/(jωC)]
= 1/(1+jωRC)
則:
||Av|| = (|1|) / (||1+jωRC||)
= 1 / SQRT[1+(ωRC)^2]
折轉頻率的定義是||Av||=1/SQRT(2)處,由上式得:
(ωRC)^2 = 1
ωRC = 1
ω = 1/(RC)
∴f = ω/(2π) = 1/(2πRC)
Av = [1/(jωC)]/[R+1/(jωC)]
= 1/(1+jωRC)
則:
||Av|| = (|1|) / (||1+jωRC||)
= 1 / SQRT[1+(ωRC)^2]
折轉頻率的定義是||Av||=1/SQRT(2)處,由上式得:
(ωRC)^2 = 1
ωRC = 1
ω = 1/(RC)
∴f = ω/(2π) = 1/(2πRC)