Study the effect of Butterworth filter’s order on the ideal filter approximation for Butterworth low pass filter

The wide transition band tells that the transmission of a physical circuit cannot change abruptly at the edge of the passband. The size of transition band describes the filter performance. The narrower the transition band, the better filter performance. Theoretically, as the numbers of order increased, the filter will approximate ideal filter characteristics. The challenges are; by increasing the filter’s order, it will increase the circuit complexity and the cost. In order to reduce the circuit complexity, the Sallen-Key equal components topology has been selected since the topology requires fewer components and easy to dimension. This paper thesis also presents the techniques and issues that should be considered while designing the schematic and layout of the filter.