9.1 Introduction9.2 Concept of Filter Circuit Using Passive ‘RCL’ Components9.3 Transfer Function Concept, Analysis, and Design9.4 First-order Active Filters9.5 Active Low-pass Butterworth Filter9.6 Active High-pass Butterworth Filter9.7 Switched Capacitor Filters9.8 Active Band-pass Filter9.9 Active Band Rejection (Stop) Filter9.10 All-pass Filter9.11 Multiple Feedback Filters (IGMF Filters)9.12 State Variable FiltersPoints to RememberSummaryQuestions for PracticeMultiple-choice Questions