Second order universal filter using voltage follower topology

In this paper, a voltage mode multi input single output second order universal filter based on the voltage follower concept is proposed. The MISO filter offers low-pass, band-pass, high-pass, all-pass and band-stop filters which is digital selecting by the input. The filter design consists of positive feedback and feed forwards path to implement a universal filter. The positive feedback is used to increase the quality factor of the filter. The feed forwards path is necessary to create zeros for the band-stop and high-pass filter. The proposed filter has many advantages such as an electronically tunable filter response, low power consumption and area. The performance of the proposed design has been tested using CMOS 130nm process technology.