DV-EXCCCII-Based Electronically Tunable Current Mode Filter

Abstract

Since several decades, current mode became an important and more efficient approach to design an analog circuit. Analog circuit designed using current mode technique results in high-performance circuit with high slew rate, greater linearity, simple circuit design, low power consumption and large bandwidth in comparison with its voltage mode counterparts. Filter is an important circuit element in many analog signal applications. Among all the filters, the first-order filter has application in video, audio, communication, instrumentation and many other areas where low power and simple circuitry are priority. The first-order universal filter is a circuit which is able to realize first-order low-pass (LP), high-pass (HP) and all-pass (AP) filters. Several first-order filters are reported in the literature employing operational amplifier [1,2]. Due to potential advantages of current mode (CM) approach over voltage mode (VM), researcher's attention shifted toward CM technique. Previously, a lot of first-order universal filters employing current mode active blocks are discussed in the literature. Some of the most discussed active analog blocks are CCI [3

Current-Mode Active Filter Using EX-CCCII

“…This is advantageous for applications such active filters and oscillators. The EX-CCCII can be used for applications such as oscillators [19][20][21][22][23], instrumentation amplifiers [24,25], immittance simulators [26], precision rectifiers [27], first-order filters [28][29][30], and universal filters [31][32][33][34]. This work focuses on the EX-CCCII based universal filter.…”