Active filter �͡Ẻ��Фӹdz filter Ẻ Fourth - order �����¡�ù� filter Ẻ second - order �ҵ�͡ѹ ������ҧ��äӹdz ���͡Ẻ Low pass filter Ẻ order ��� 4 �·���� f-3 dB = 3kHz ? Solution ��ҵ�ͧ����Ңͧ damping ��� factors ����ͧ�Ӥ������� "�����������ú���¤��駪�����¤���"
Active filter