A comparison approach of lowpass type wave active filter using unified circuit block

This paper reports 3 types of novel design approaches for the wave active filter circuit. Proposed circuits are realized with the combination of only one kind of unified circuit block connected with R and C. Comparison experiments for the sensitivity to the errors of the element values are performed, and it is found that the sensitivity of proposed wave active filter circuits become zero at low frequency. Proposed circuits are available for the realization of lowpass type filter without transmission zeros.