A Novel Sixth Order RC- Butterworth Low Pass Filter Implementation Using Folded Cascode OTA

Abstract

In this study, a novel continuous time 6^th order Low Pass RC- Butterworth filter has been proposed by utilizing a FOLDED CASCODE OTA as an active component. The filter circuitry operates at a lower supply voltage of 0.75V in 0.18μm technology with a 3db bandwidth of 550 kHz. The basic building block i.e., FOLDED OTA is designed in 0.18μm CMOS process operated at 2.5V supply and having a bias current of 100 μA. The reported FOLDED CASCODE OTA based filter circuitry overcomes the bandwidth limitations of operational amplifier (Op-amps) based filters. Moreover, it provides comparatively higher speed of operation and low power consumption. TANNER TOOL 13.0 is used for all the performance analysis and simulative investigations.