International Journal of Academic Information Systems Research (IJAISR)   Year: 2023 | Volume: 7 | Issue: 1 | Page No.: 18-25 Study of Second Order Active-R Filter Using a Combination of Current Feedback Operational Amplifier (Cfoa) and Classical Operational Amplifier (Cloa) Realising Composite Circuit for Mobile Applications Download PDF Atsuwe, Bernard Aondofa. Mom, Joseph. Agbo, David. Abstract: The second order Active-R Bandpass filter using a combination of classical op-amp (CLOA) and current feedback op-amp (CFOA) to realize a composite circuit was designed simulated and results presented. The circuit utilized two op-amps OPA627AM of CLOA type and OPA603AP of CFOA type, 7 resistors with different values, input and output sources, NI Multisim software for simulation. The Active-R filter was also utilized due to its advantages over the Active-RC filters. Results showed good agreement with filter specification; therefore it can be used in the implementation in any Mobile Communications Receiver systems.