State Variation Filter

Example

����Ңͧ��ǹ��ҧ � �ͧ filter Ẻ Variable state

R=10k , Rf=4.7k,Ra=22k,Rb=7.5k,C=0.001uF

Determine the filter response by calculating the parameter below.

a.daming coefficient and type filter(Bessel,Butterworth,Chebyshev)

b.low pass and high pass f-3 db

c.band pass center frequency

d.band pass band width

e.band pass gain at the center frequency

Solution

a.The damping coefficient is

�ҡ��� 0.766 ��Ẻ 3 db Chebyshev

b.��������ҧ

��� low pass ��� high pass f-3 db �ж١��ͧ���ͧ�٨ҡ���ҧ factor