In this tutorial paper, the state of the art of analog filter design is reviewed. The various design methodologies for Active RC filter design using operational amplifiers (opamps), Operational Transconductance amplifier (OTA)-C based filters, switched-capacitor (SC) technique , current-mode devices such as current conveyors, Current-feedback amplifiers are presented. The various design considerations and analysis techniques are highlighted. In adition, some of the recent approaches for active filter design using transistors are also considered for completeness.
Mohan, P V Ananda
"Analog Active Filters: State of the Art,"
Manipal Journal of Science and Technology: Vol. 1:
1, Article 2.
Available at: https://impressions.manipal.edu/mjst/vol1/iss1/2